Biazzo Law Participates on Winning Side in U.S. Supreme Court Birthright Citizenship Case Trump v. Barbara

By Biazzo Law, PLLC

June 30, 2026

Biazzo Law, PLLC participated as amicus curiae on the winning side in Trump v. Barbara, No. 25-365, a major United States Supreme Court case involving birthright citizenship, the Fourteenth Amendment, Executive Order 14160, and the constitutional limits of executive power.

The Supreme Court held that children born in the United States to parents who are unlawfully or temporarily present are “subject to the jurisdiction” of the United States and are citizens at birth under the Fourteenth Amendment’s Citizenship Clause.

Biazzo Law filed a merits-stage amicus curiae brief in support of the Respondents. Earlier in the case, Corey J. Biazzo and Kevin Song also filed a joint amicus brief supporting the Respondents and defending the Fourteenth Amendment’s original, territorial rule of birthright citizenship.

The Court did not cite the Biazzo Law merits amicus brief by name. But several core themes advanced in the Biazzo Law filings appeared to echo in the majority opinion: the territorial rule of citizenship, the rejection of a domicile-based limitation, the central role of United States v. Wong Kim Ark, the narrow set of historical exceptions, and the principle that immigration status does not define constitutional jurisdiction at birth.

Quick Answer: What Did the Supreme Court Decide in Trump v. Barbara?

The Supreme Court held that the Fourteenth Amendment guarantees citizenship to children born in the United States to parents who are unlawfully or temporarily present in the country.

The case arose after President Donald J. Trump issued Executive Order 14160, titled Protecting the Meaning and Value of American Citizenship. The Executive Order attempted to deny citizenship to certain U.S.-born children based on the immigration status or temporary presence of their parents.

The Supreme Court rejected that interpretation.

The Court reaffirmed that the Citizenship Clause provides a territorial rule: a child born in the United States and subject to the jurisdiction of the United States is a citizen at birth. The Court concluded that children born in the United States to parents unlawfully or temporarily present satisfy that rule.

Why This Case Matters

This case matters because citizenship is the legal foundation of national membership.

Birthright citizenship affects identity, family stability, federal benefits, passports, voting rights, employment rights, military service, public education, equal protection, due process, and the ability to participate fully in American civic life.

The question was not merely an immigration policy question.

It was a constitutional question:

Can the President, by executive order, narrow the Fourteenth Amendment’s Citizenship Clause and deny citizenship to U.S.-born children based on their parents’ immigration status?

The Supreme Court’s answer was no.

Biazzo Law’s Role in the Case

Biazzo Law participated in the case through amicus curiae briefing in support of the Respondents.

The earlier joint amicus brief was filed by Corey J. Biazzo, Esq. and Kevin Song. That brief defended the Fourteenth Amendment’s original, territorial rule of citizenship — jus soli — against reinterpretation by executive decree.

Kevin Song deserves specific credit for his work in the joint brief. The brief identified Mr. Song as an independent constitutional scholar whose work focuses on the original meaning and logical structure of the Fourteenth Amendment’s Citizenship Clause as interpreted in United States v. Wong Kim Ark. The joint brief combined Biazzo Law’s institutional and separation-of-powers arguments with Mr. Song’s doctrinal and historical analysis of the Amendment’s jurisdictional logic.

Read the joint Biazzo/Song amicus brief here:https://www.supremecourt.gov/DocketPDF/25/25-365/381050/20251029164823983_Brief%20to%20File.pdf

Biazzo Law later filed a merits-stage amicus brief addressing the structural limits imposed by Articles II, III, and V when executive action seeks reconsideration of long-settled constitutional meaning.

Read the Biazzo Law merits amicus brief here:https://www.supremecourt.gov/DocketPDF/25/25-365/399391/20260226143931545_Brief%20Amicus%20Curiae%20Corey%20Biazzo%20to%20File.pdf

Read the Supreme Court’s opinion here:https://www.supremecourt.gov/opinions/25pdf/25-365_4hdj.pdf

What Biazzo Law Argued

Biazzo Law’s merits amicus brief advanced several related points.

First, United States v. Wong Kim Ark settled a territorial rule of birthright citizenship.

Second, the Government’s domicile theory misread the Citizenship Clause by treating parental immigration status as constitutionally relevant to whether a U.S.-born child is “subject to the jurisdiction” of the United States.

Third, stare decisis strongly supported reaffirming Wong Kim Ark because the decision has endured for more than a century, has generated profound reliance interests, and provides a clear rule.

Fourth, executive disagreement with Supreme Court precedent does not supply a valid basis for constitutional reinterpretation.

Fifth, Article V counsels structural caution when a proposed reinterpretation would alter a foundational rule of national membership.

Biazzo Law’s position was straightforward:

The Executive Branch may advocate for constitutional change, but it may not rewrite the Fourteenth Amendment by unilateral directive.

Where the Biazzo Law Merits Brief Appeared to Echo in the Majority Opinion

The Supreme Court did not cite Biazzo Law’s merits amicus brief by name.

That is common. Amicus briefs often influence framing, structure, or issue presentation without being expressly cited.

Here, several major themes in the majority opinion appeared to align with the Biazzo Law merits brief and the earlier joint Biazzo/Song brief.

1. The Territorial Rule of Birthright Citizenship

Biazzo Law argued that Wong Kim Ark established a territorial rule of birthright citizenship.

The Supreme Court’s majority opinion likewise treated the Citizenship Clause as rooted in the common-law principle of jus soli: birth within the sovereign’s territory, combined with subjection to the sovereign’s jurisdiction, establishes citizenship.

The Court explained that the Fourteenth Amendment starts with territory: a child must be “born . . . in the United States.” It then ends with sovereign power: the child must be “subject to the jurisdiction” of the United States.

That reasoning closely tracks the central premise of Biazzo Law’s merits brief: the Citizenship Clause is territorial, not status-based.

2. Immigration Status Does Not Define Constitutional Jurisdiction

Biazzo Law argued that the Government’s domicile and parental-status theories misread the phrase “subject to the jurisdiction.”

The merits brief emphasized that the historically recognized exceptions to birthright citizenship were tied to the absence of sovereign jurisdiction, not the immigration status of the parents.

The majority opinion reached the same basic conclusion.

The Court held that children born in the United States to parents unlawfully or temporarily present are subject to the jurisdiction of the United States. The majority reasoned that private individuals within U.S. territory are generally subject to U.S. law, even if their presence is temporary or unlawful.

That point is critical.

If a person can be taxed, regulated, prosecuted, detained, removed, or otherwise governed by the United States, that person is ordinarily subject to the jurisdiction of the United States. The Executive Order attempted to transform immigration status into a constitutional jurisdictional exception. The Court rejected that move.

3. The Domicile Theory Failed

Biazzo Law’s merits brief argued that Wong Kim Ark did not constitutionalize a lawful-residence or domicile requirement.

The majority opinion directly rejected arguments for limiting birthright citizenship to children of parents domiciled in the United States.

The Court explained that domicile and citizenship are distinct legal concepts. A person can establish domicile in a country without automatically becoming a citizen, and a person can retain citizenship without remaining domiciled there.

The majority also emphasized that the text of the Citizenship Clause does not contain words such as “mother,” “father,” “lawful,” “temporary,” or “domicile.”

That point echoes Biazzo Law’s argument that the Executive Order attempted to add a new limitation that does not appear in the constitutional text.

4. Wong Kim Ark Remained Controlling

Biazzo Law argued that United States v. Wong Kim Ark remained controlling and should be reaffirmed.

The Supreme Court did exactly that.

The majority described Wong Kim Ark as confirming the birthright citizenship rule. The Court explained that Wong Kim Ark treated the Fourteenth Amendment as declaratory of the common-law rule of citizenship by birth, subject only to narrow historically recognized exceptions.

The Government and dissenting opinions attempted to narrow Wong Kim Ark to its facts, especially by emphasizing that Wong’s parents were domiciled in the United States.

The majority rejected that narrowing.

That is one of the strongest points of overlap between the Biazzo Law merits brief and the Court’s opinion.

5. The Exceptions Were Narrow

The Biazzo/Song joint brief emphasized that Wong Kim Ark recognized a closed set of narrow exceptions: children of foreign diplomats, foreign public ships, hostile occupiers, and tribal sovereigns as historically understood.

Biazzo Law’s merits brief similarly argued that those exceptions were grounded in the absence of sovereign jurisdiction, not parental immigration status.

The majority opinion likewise treated the exceptions as narrow and historically rooted.

The Court explained that the classic exceptions involved circumstances where the United States did not exercise ordinary territorial jurisdiction: foreign ministers, foreign sovereign dignity, hostile occupation, and the unique historical status of Indian tribes.

The Court refused to add a new exception for children born to parents unlawfully or temporarily present.

6. Constitutional Citizenship Cannot Be Rewritten by Executive Order

Biazzo Law’s merits brief focused heavily on constitutional structure.

The brief argued that Article II requires the President to faithfully execute the law, not revise constitutional meaning. It also argued that Article III assigns constitutional interpretation to the Judiciary, and Article V supplies the process for formal constitutional amendment.

The Supreme Court’s merits holding did not need to dwell extensively on every separation-of-powers point because the Court resolved the citizenship question directly. But the result strongly vindicates the structural concern: an executive order cannot override the Fourteenth Amendment.

The Executive Branch may disagree with precedent. It may advocate for a different interpretation in litigation. It may ask the Court to revisit precedent. But unless and until the Constitution is lawfully amended or the Court changes its precedent through principled adjudication, the Executive Branch must obey the Constitution as interpreted by the Court.

The Majority Opinion

Chief Justice Roberts wrote the majority opinion, joined by Justices Sotomayor, Kagan, Barrett, and Jackson.

The majority held that children born in the United States to parents unlawfully or temporarily present are citizens at birth under the Fourteenth Amendment.

The Court’s reasoning rested on several major points:

the English common law recognized birth within the sovereign’s dominions as the basis for natural-born subject status;

that common-law rule crossed the Atlantic and became part of American legal understanding;

Dred Scott departed from that tradition by substituting blood for soil;

the Fourteenth Amendment repudiated Dred Scott and constitutionalized a broad citizenship rule;

the phrase “subject to the jurisdiction” refers to the power of the United States to govern persons within its territory;

private individuals temporarily present in the United States are generally amenable to U.S. jurisdiction;

Wong Kim Ark confirmed the territorial rule of birthright citizenship;

the Government’s domicile theory lacked sufficient textual, historical, or doctrinal support;

the Executive Order’s parental-status categories do not appear in the Citizenship Clause.

The majority’s bottom line was clear: children born in the United States to parents unlawfully or temporarily present are citizens at birth.

Justice Jackson’s Concurrence

Justice Jackson wrote separately, joined in part by Justice Sotomayor, to emphasize the broader Reconstruction meaning of the Fourteenth Amendment.

Her concurrence framed the Citizenship Clause as part of the Second Founding’s anticaste and antisubordination reset. She emphasized that the Fourteenth Amendment was not merely a narrow fix for one category of freed slaves, but part of a broader constitutional transformation that changed the meaning of national citizenship.

That concurrence reinforces the public importance of the case.

The Citizenship Clause is not merely an immigration rule. It is a Reconstruction guarantee of equal national membership.

The Separate Opinions

Justice Kavanaugh concurred in the judgment and dissented in part. He agreed with the result based on the governing statute, 8 U.S.C. § 1401(a), but took a different view of the constitutional question.

Justice Thomas dissented, joined by Justice Gorsuch.

Justice Alito dissented.

Justice Gorsuch also filed a dissenting opinion.

The dissenting opinions argued, in different ways, that the Citizenship Clause should not be read to guarantee birthright citizenship to all children born in the United States to parents unlawfully or temporarily present.

The majority rejected those arguments.

Why This Is a Meaningful Result for Biazzo Law

Biazzo Law supported the Respondents.

The Supreme Court affirmed the judgment and rejected the Executive Order’s attempt to deny citizenship to the covered U.S.-born children.

That places Biazzo Law on the winning side of one of the most important Fourteenth Amendment and citizenship cases in modern Supreme Court practice.

This is also significant because the case involved issues central to Biazzo Law’s constitutional practice:

constitutional text;

historical meaning;

stare decisis;

separation of powers;

executive authority;

Article III judicial review;

Article V amendment structure;

federal statutory incorporation of constitutional language;

civil liberty and national membership.

Kevin Song’s Important Contribution

Kevin Song deserves express credit for his work in the earlier joint amicus brief.

The joint brief combined two complementary strands of analysis.

Biazzo Law’s institutional arguments emphasized constitutional structure, separation of powers, judicial review, and the danger of executive reinterpretation of settled constitutional meaning.

Kevin Song’s work focused on the original meaning and logical structure of the Fourteenth Amendment’s Citizenship Clause, especially as interpreted in United States v. Wong Kim Ark.

That contribution mattered because the Supreme Court’s majority opinion centered heavily on the precise interpretive issues the joint brief addressed: jus soli, jurisdiction, allegiance, protection, domicile, and the narrow historical exceptions to birthright citizenship.

The merits-stage Biazzo Law brief then continued and refined those themes for the Court’s final review.

What This Case Does Not Mean

This decision should not be overstated.

The Supreme Court did not eliminate Congress’s power over immigration and naturalization.

The Court did not prevent the federal government from enforcing immigration laws.

The Court did not decide every possible citizenship question.

The Court did not hold that immigration status is irrelevant in every constitutional setting.

The Court held that children born in the United States to parents unlawfully or temporarily present are citizens at birth under the Fourteenth Amendment’s Citizenship Clause.

That precision matters.

This case is about constitutional citizenship at birth. It is not a general ruling on every immigration policy dispute.

Why Trump v. Barbara Matters for Constitutional Law

Trump v. Barbara is a major constitutional law decision because it reaffirms that the Fourteenth Amendment’s Citizenship Clause has a fixed legal meaning that cannot be changed by executive order.

The case confirms that constitutional rights and constitutional status cannot be altered by unilateral presidential directive.

That principle protects everyone.

A President may strongly disagree with a precedent. A President may ask courts to reconsider precedent.

A President may advocate for constitutional amendment. But a President may not make constitutional citizenship depend on executive preference.

That is the rule-of-law lesson of Trump v. Barbara.

Why Trump v. Barbara Matters for Separation of Powers

The case also matters because it reinforces separation of powers.

Article II gives the President the power and duty to execute the law. It does not give the President power to amend the Constitution.

Article III gives courts the power to decide cases and say what the law is.

Article V provides the process for constitutional amendment.

Biazzo Law’s merits brief focused on those structural limits. The Supreme Court’s decision confirms the practical importance of that structure: birthright citizenship cannot be narrowed by executive order when the Constitution and Supreme Court precedent say otherwise.

Why Trump v. Barbara Matters for Civil Liberty

Citizenship is not merely paperwork.

Citizenship is the right to have rights. It is the legal status that anchors belonging in the American constitutional order.

A rule that made citizenship depend on parental paperwork, visa classification, or temporary immigration status would introduce uncertainty at birth and invite ongoing litigation over the legal status of millions of people.

The territorial rule reaffirmed in Trump v. Barbara provides clarity.

A child born in the United States and subject to U.S. jurisdiction is a citizen at birth.

That rule protects legal stability, family reliance, and national cohesion.

Biazzo Law’s U.S. Supreme Court and Amicus Practice

Biazzo Law handles U.S. Supreme Court practice, amicus curiae briefs, constitutional litigation, federal appeals, emergency applications, and high-stakes legal strategy.

Trump v. Barbara is another example of Biazzo Law’s participation in nationally significant constitutional litigation.

Amicus briefs matter because they help courts understand the broader constitutional structure, historical context, legal consequences, and institutional stakes of a case. In Trump v. Barbara, Biazzo Law’s amicus work focused on the territorial rule of citizenship, the limits of executive power, the role of stare decisis, and the importance of preserving Article III and Article V safeguards.

Learn more about Biazzo Law’s U.S. Supreme Court practice here:https://www.biazzolaw.com/biazzolawscotuspractice

Learn more about Biazzo Law’s amicus curiae practice here:https://www.biazzolaw.com/amicus-curiae-briefs

Biazzo Law’s Constitutional Law Practice

Biazzo Law represents clients and works with referring counsel in constitutional litigation involving separation of powers, due process, civil rights, federalism, government overreach, emergency injunctions, appeals, and U.S. Supreme Court strategy.

The firm’s constitutional law practice focuses on appellate-aware litigation: preserving issues early, framing constitutional questions carefully, and preparing cases for possible review in the federal courts of appeals and the Supreme Court.

Learn more about Biazzo Law’s Constitutional Law practice here:https://www.biazzolaw.com/constitutional-law-attorney

Biazzo Law’s Government Oversight Perspective

Trump v. Barbara is also a government oversight case.

It concerns whether the Executive Branch may use an executive order to alter the constitutional definition of citizenship. That is not merely a political dispute. It is a constitutional accountability issue.

Biazzo Law’s Government Oversight Program focuses on lawful, nonpartisan public education, government transparency, constitutional accountability, and the limits of government power.

The principle is simple:

No branch of government may rewrite the Constitution by unilateral action.

Learn more about the Biazzo Law Government Oversight Program here:https://www.biazzolaw.com/biazzolawgovernmentoversight

Key Takeaway

Biazzo Law participated on the winning side in Trump v. Barbara.

The Supreme Court held that children born in the United States to parents unlawfully or temporarily present are citizens at birth under the Fourteenth Amendment.

Biazzo Law’s merits amicus brief argued that Wong Kim Ark settled a territorial rule of birthright citizenship, that the Government’s domicile theory misread the Citizenship Clause, that stare decisis strongly supported reaffirmation, and that executive disagreement with precedent cannot rewrite constitutional meaning.

The Court did not cite the brief by name. But the majority opinion appeared to echo several of the brief’s central themes: territorial citizenship, rejection of the domicile theory, narrow historical exceptions, and the constitutional limits of executive power.

Kevin Song also deserves credit for his work in the earlier joint amicus brief, especially his contribution to the original-meaning and jurisdictional-logic analysis of the Citizenship Clause.

The result is a major reaffirmation of the Fourteenth Amendment, constitutional structure, and the rule of law.

Frequently Asked Questions

What is Trump v. Barbara?

Trump v. Barbara is a U.S. Supreme Court case involving birthright citizenship, Executive Order 14160, and whether children born in the United States to parents unlawfully or temporarily present are citizens under the Fourteenth Amendment.

What did the Supreme Court decide?

The Supreme Court held that children born in the United States to parents unlawfully or temporarily present are “subject to the jurisdiction” of the United States and are citizens at birth under the Fourteenth Amendment’s Citizenship Clause.

Was Biazzo Law involved?

Yes. Biazzo Law filed a merits-stage amicus curiae brief in support of the Respondents. Earlier, Corey J. Biazzo and Kevin Song filed a joint amicus brief supporting the Respondents.

Was Biazzo Law on the winning side?

Yes. Biazzo Law supported the Respondents, and the Supreme Court affirmed the judgment rejecting the Executive Order’s attempt to deny citizenship to the covered U.S.-born children.

Did the Supreme Court cite Biazzo Law’s amicus brief?

No. The Court did not cite the Biazzo Law merits amicus brief by name. However, several key themes in the majority opinion appeared to echo Biazzo Law’s arguments, including the territorial rule of birthright citizenship, rejection of the domicile theory, narrow historical exceptions, and limits on executive reinterpretation of constitutional meaning.

Who is Kevin Song, and what was his role?

Kevin Song is an independent constitutional scholar whose work focuses on the original meaning and logical structure of the Fourteenth Amendment’s Citizenship Clause. He joined Corey J. Biazzo in the earlier joint amicus brief and contributed important doctrinal and historical analysis concerning Wong Kim Ark and the jurisdictional logic of birthright citizenship.

What was Biazzo Law’s main argument?

Biazzo Law argued that Wong Kim Ark established a territorial rule of birthright citizenship, that parental immigration status does not create a new exception to the Citizenship Clause, and that executive disagreement with precedent cannot rewrite constitutional meaning.

What is Wong Kim Ark?

United States v. Wong Kim Ark is the 1898 Supreme Court decision holding that the Fourteenth Amendment protects birthright citizenship for persons born in the United States and subject to its jurisdiction.

What does “subject to the jurisdiction” mean?

In this context, the Supreme Court treated “subject to the jurisdiction” as referring to the United States’ power to govern persons within its territory, subject to narrow historical exceptions such as foreign diplomats and certain sovereign or quasi-sovereign contexts.

Does this case prevent immigration enforcement?

No. The decision concerns citizenship at birth under the Fourteenth Amendment. It does not eliminate federal immigration enforcement authority.

Can Biazzo Law help with constitutional or Supreme Court matters?

Yes. Biazzo Law handles constitutional litigation, federal appeals, U.S. Supreme Court strategy, amicus curiae briefs, emergency applications, and government oversight matters.