How Impeachment Works and Why It Matters Without Conviction
In short: The House impeaches by a simple majority. The Senate convicts only with two-thirds of the Senators present, and no President has ever been convicted. Even so, an impeachment inquiry can build a sworn public record, deter future abuse, and preserve evidence. It does not prevent later criminal prosecution: the Constitution says an impeached official remains subject to indictment and trial "according to Law." But realistic limits apply. They include the Supreme Court's 2024 presidential-immunity decision, statutes of limitations, and the Justice Department's policy against indicting a sitting President. A presidential self-pardon has never been tested in court, would not reach state crimes, and would face serious legal challenge.
This post explains the constitutional process, what it can and cannot accomplish, and how it interacts with possible federal and state prosecution. It is written for Members of Congress and their staff, for lawyers, and for any citizen who wants an accurate picture rather than a partisan one. With the 120th Congress convening on January 3, 2027, these questions are no longer academic. The same rules would apply to any President, of any party.
Key takeaways
Impeachment is a charge, not a conviction. The House impeaches. The Senate tries the case and decides whether to remove.
Conviction is rare by design. Three Presidents have been impeached four times: Andrew Johnson (1868), Bill Clinton (1998), and Donald Trump (2019 and 2021). None was convicted.
The process has value beyond the verdict. Subpoenas, sworn testimony, and published findings create a durable record that informs the public, future Congresses, and prosecutors.
Impeachment and prosecution are separate tracks. Conviction in the Senate is not required for criminal charges, and acquittal does not prevent them.
The limits are real. Presidential immunity, statutes of limitations, Justice Department policy, and the pardon power all shape what can happen later.
A self-pardon is legally doubtful and narrow in reach. It is untested, contrary to a 1974 Justice Department legal opinion, and inapplicable to state crimes.
How does impeachment work under the Constitution?
The Constitution sets out impeachment in four short provisions. Who may be impeached. "The President, Vice President and all civil Officers of the United States" may be removed "on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors" (Art. II, § 4). This includes Cabinet secretaries and federal judges.
The House charges. The House "shall have the sole Power of Impeachment" (Art. I, § 2, cl. 5).
The Senate tries. The Senate has "the sole Power to try all Impeachments." When the President is tried, the Chief Justice presides. Conviction requires "the Concurrence of two thirds of the Members present" (Art. I, § 3, cl. 6).
The penalty is limited. Judgment "shall not extend further than to removal from Office, and disqualification to hold and enjoy any Office of honor, Trust or Profit under the United States." The convicted official "shall nevertheless be liable and subject to Indictment, Trial, Judgment and Punishment, according to Law" (Art. I, § 3, cl. 7).
In practice, the process usually moves through these stages:
Stage | Who acts | Vote required | What it produces |
1. Inquiry | House committees, often after a resolution authorizing the inquiry | Majority, if the full House votes to authorize | Subpoenas, documents, sworn testimony, hearings |
2. Articles | House Judiciary Committee | Committee majority | Written articles of impeachment and a committee report |
3. Impeachment | Full House | Simple majority of those voting | The official is "impeached"; House managers are appointed |
4. Trial | Senate, sitting as a court of impeachment | Rules set by the Senate | Presentation of evidence, possible witnesses, deliberation |
5. Verdict | Senate | Two-thirds of Senators present to convict, voted on each article | Removal from office on conviction |
6. Disqualification | Senate, after conviction | Simple majority, under Senate precedent | Bar from future federal office |
Two features are often misunderstood. First, "high Crimes and Misdemeanors" is not limited to statutory crimes. The House Judiciary Committee concluded in the Nixon, Clinton, and 2019 Trump inquiries that the phrase reaches serious abuse of official power, betrayal of the nation's interests, and corruption of office or elections. Second, the President's pardon power expressly excludes "Cases of Impeachment" (Art. II, § 2, cl. 1). No pardon can stop an impeachment or undo a conviction.
The Senate has also treated former officials as subject to trial. In 1876, it tried Secretary of War William Belknap after his resignation. In February 2021, it voted 56–44 that it had jurisdiction to try a former President, although the vote to convict (57–43) fell short of two-thirds.
What impeachment cannot do: setting realistic expectations
Anyone weighing impeachment should start with its limits.
Conviction is unlikely in a closely divided Senate. Conviction requires 67 votes if all 100 Senators are present. No President has ever been convicted. The 2021 vote, 57–43, was the closest so far.
Impeachment imposes no criminal punishment. The only possible penalties are removal and disqualification. There are no fines and no prison.
Congress cannot prosecute. Criminal charges are brought by the Justice Department or by state prosecutors. A congressional "criminal referral" is a recommendation. It binds no one.
The calendar is short. The President's current term ends at noon on January 20, 2029, and the Twenty-Second Amendment bars election to a third term. An inquiry that begins in 2027 is working against that clock.
Courts rarely referee the process. The Supreme Court has treated the Senate's conduct of impeachment trials as a matter for the Senate (Nixon v. United States, 506 U.S. 224 (1993)). Disputes over subpoenas to the Executive Branch can take months or years to resolve in court.
It can deepen division. Impeachment is a political process as well as a legal one. A process seen as partisan can lose public trust whatever the merits.
None of this means impeachment lacks value. It means that the value has to be measured by more than the final Senate vote.
How can impeachment promote accountability and deterrence without a conviction?
The Framers designed impeachment to protect the constitutional order, not to punish. Measured that way, a well-run inquiry can accomplish a good deal even if the Senate acquits.
It establishes the facts under oath. House committees can compel documents and testimony. Witnesses who testify falsely to Congress risk prosecution for false statements or perjury (18 U.S.C. §§ 1001, 1621). Findings published in a committee report become part of the permanent public record.
It informs the public and the voters. Hearings and reports let citizens judge for themselves what happened, rather than relying on competing claims. That record informs elections, which remain the primary form of accountability in a democracy.
It sets precedent. Each impeachment, whatever its outcome, tells future Presidents and their subordinates what Congress regards as an abuse of power. A decision not to act can set a precedent too.
It deters future officials. Officials who know that their conduct may be examined under oath, in public, are less likely to cross legal lines. That holds for Cabinet officers and agency heads, not only the President.
It reaches subordinates. Cabinet officers and other civil officers can be impeached too. The prospect alone can matter: Secretary of War Belknap resigned in 1876 hours before the House voted to impeach him.
It informs legislation. The facts developed in an inquiry often reveal gaps in the law. Congress can close them through statutes and funding conditions. Examples include clarifying war powers, tightening emoluments disclosure, and protecting inspectors general.
Watergate is the clearest historical example. President Nixon was never impeached by the full House; he resigned in August 1974 after the Judiciary Committee approved articles. The congressional record nonetheless shaped a generation of reforms, including the Ethics in Government Act, the Presidential Records Act, and modern inspector-general laws.
Can an impeachment inquiry preserve evidence for a later criminal prosecution?
It can help, within real limits. Article I, Section 3 makes clear that impeachment and criminal prosecution are separate: an official removed by the Senate "shall nevertheless be liable" to indictment and trial. Acquittal is not a defense to a criminal charge either.
How an inquiry helps preserve evidence
Preservation demands. Committees can send preservation letters to agencies, the White House, and private parties at the outset. Destroying records sought by Congress can itself be a crime (18 U.S.C. §§ 1505, 1519).
Presidential records. Under the Presidential Records Act, the President's official records belong to the United States and pass to the National Archives when the term ends (44 U.S.C. § 2201 et seq.). A congressional inquiry helps identify what exists and creates pressure to keep it intact.
Sworn testimony on the record. Testimony taken while memories are fresh, and subject to false-statement laws, can later guide investigators.
Referrals. Committees may refer matters to the Justice Department or to state prosecutors. In December 2022, for example, the House January 6th Committee made criminal referrals and later shared its transcripts with federal investigators.
The legal limits on using that evidence
Presidential immunity. In Trump v. United States, 603 U.S. 593 (2024), the Supreme Court held that a former President has absolute immunity for acts within his core constitutional powers and at least presumptive immunity for other official acts, but no immunity for unofficial acts. The Court also held that prosecutors may not introduce evidence of immunized official acts even when prosecuting unofficial conduct. Much of what an impeachment inquiry examines is official conduct, so this ruling sharply limits its later use in a criminal case against a former President. It leaves more room for purely private conduct, such as personal business dealings or lawsuits brought in a personal capacity.
Immunized testimony. If Congress compels a witness's testimony by granting immunity (18 U.S.C. §§ 6002–6005), that testimony and evidence derived from it generally cannot be used against the witness. The Iran-Contra convictions of Oliver North and John Poindexter were reversed on this ground (United States v. North, 910 F.2d 843 (D.C. Cir. 1990)). Congress and prosecutors must coordinate carefully.
Timing. Most federal crimes carry a five-year statute of limitations (18 U.S.C. § 3282). The Justice Department's Office of Legal Counsel has concluded, in 1973 and again in 2000, that a sitting President may not be indicted. Conduct from early 2025 could therefore leave only a narrow window after January 20, 2029. Congress could extend limitations periods for future conduct, or for offenses whose limitations period has not yet run, but it cannot revive a time-barred prosecution (Stogner v. California, 539 U.S. 607 (2003)).
Prosecutorial discretion. Whether to charge any person, and whom, is decided by prosecutors and grand juries, not by Congress.
Could federal or state criminal charges follow after a President leaves office?
Possibly, but less easily than many people assume. The question is not whether anyone can be prosecuted. It is which conduct, by whom, in which court, and before which deadline. This section describes legal possibilities only. No court has found that the President committed a crime during his second term, and every person is presumed innocent.
Path | What is possible | Main obstacles |
Federal charges against a former President | Prosecution for unofficial conduct, and in narrow cases for official conduct where the presumption of immunity can be overcome | Trump v. United States immunity and its evidentiary bar; statutes of limitations; the policy against indicting a sitting President; a successor's decision whether to prosecute |
Federal charges against other officials | Prosecution of subordinates and private parties for their own conduct, such as false statements, obstruction, or misuse of funds | Defenses based on reliance on official legal advice; pardons, which the President may grant to others for federal offenses |
State charges | State prosecutors may charge violations of state law, and a federal pardon does not reach state crimes | Supremacy Clause immunity for federal officers acting within the scope of their duties (In re Neagle, 135 U.S. 1 (1890)); likely application of presidential immunity for official acts; removal of the case to federal court (28 U.S.C. § 1442); jurisdiction and venue |
Civil remedies | Lawsuits, fraud-on-the-court proceedings, disgorgement, and bar discipline for the lawyers involved | Standing, sovereign immunity, and official-capacity defenses |
State law is often overlooked. State prosecutors are independent of the federal government, and the President's pardon power covers only "Offences against the United States." State cases arising from a President's private business or personal conduct face fewer obstacles than cases arising from official federal acts. For example, a New York jury convicted the President in May 2024 on state charges of falsifying business records relating to a 2016 payment; he received an unconditional discharge in January 2025, and the case is on appeal. Charges against federal officers for actions taken in their federal role, by contrast, will usually be removed to federal court, where Supremacy Clause immunity is litigated.
Can a President pardon himself?
No court has ever decided the question, and as of this writing no President has attempted one. The arguments run strongly against it, and even a valid self-pardon would be narrow.
Arguments against a self-pardon
Justice Department view. On August 5, 1974, four days before President Nixon resigned, the Office of Legal Counsel concluded that a President cannot pardon himself, "under the fundamental rule that no one may be a judge in his own case."
The meaning of "pardon." Historically, a pardon is an act of grace by one person toward another. A grant to oneself does not fit that understanding.
Constitutional structure. The Constitution expressly preserves criminal liability after impeachment (Art. I, § 3, cl. 7) and repeatedly limits officials' power to benefit themselves, for example through the Emoluments Clauses. A self-pardon would let a President immunize his own crimes in advance.
Arguments for a self-pardon
The Pardon Clause contains only two express limits: it applies to "Offences against the United States," and it does not apply "in Cases of Impeachment." Some scholars argue that the text permits any other pardon. The Supreme Court has described the power as broad (Ex parte Garland, 71 U.S. 333 (1866)).
What even a valid self-pardon could not do
It could not stop or undo an impeachment or Senate conviction.
It would not cover state crimes.
It would not cover future conduct; pardons reach only offenses already committed.
It would not prevent civil lawsuits or bar discipline.
Pardons of others are a different matter. A President may pardon subordinates, associates, and family members for past federal offenses, including before any charge is filed, as President Ford did for former President Nixon in 1974. Those pardons are generally valid, though a pardon granted as part of a corrupt bargain could itself be evidence of obstruction or bribery. A President could also resign and be pardoned by a successor, as with Nixon.
The realistic conclusion: a self-pardon would be litigated, would likely be challenged as invalid, and would leave state law, civil remedies, and impeachment untouched. It is not a reliable shield, but its validity remains an open question until a court decides it.
About the Biazzo Law Government Oversight Program
The Biazzo Law Government Oversight Program is a nonpartisan public-service initiative that promotes constitutional accountability through lawful, peaceful, and fact-based means. It monitors the use of government power, explains pending constitutional questions in plain language, pursues public records through FOIA, and files amicus briefs in significant cases. For Members of Congress and their staff, it publishes model articles of impeachment for the 120th Congress that may be used freely, in whole or in part.
If your office would like to discuss the impeachment process, oversight strategy, or the issues below, request a time to talk, email corey@biazzolaw.com, or call (703) 297-5777.
Further reading from the Government Oversight Program
Impeachment, immunity, and congressional power
Money, emoluments, and ethics
The Justice Department and prosecutorial power
War powers and the military
Immigration enforcement and due process
Elections, the press, and the courts
Frequently asked questions
How many votes does it take to impeach and remove a President? Impeachment requires a simple majority of the House members voting. Removal requires conviction by two-thirds of the Senators present, which is 67 votes if all 100 Senators vote.
Has a President ever been removed by impeachment? No. Andrew Johnson, Bill Clinton, and Donald Trump (twice) were impeached, and all were acquitted. Richard Nixon resigned in 1974 before the full House voted.
Does a Senate acquittal protect a President from criminal prosecution? No. The Constitution provides that impeachment and criminal liability are separate. Prosecution after office is limited instead by presidential immunity for official acts, statutes of limitations, and prosecutorial discretion.
What did Trump v. United States (2024) decide? The Supreme Court held that a former President has absolute immunity from criminal prosecution for acts within his core constitutional powers, presumptive immunity for other official acts, and no immunity for unofficial acts. It also barred prosecutors from using evidence of immunized official acts. The decision concerns criminal prosecution; it does not limit impeachment.
Can a President pardon himself? No court has decided the question. A 1974 Justice Department opinion concluded that he cannot, and a self-pardon would face serious legal challenge. Even if valid, it would not cover state crimes, civil liability, or impeachment.
Can states prosecute a former President? Yes, for violations of state law, and a presidential pardon does not reach state crimes. State cases based on official federal acts, however, face presidential immunity, Supremacy Clause immunity, and likely removal to federal court.
Can Congress bring criminal charges? No. Congress can investigate, publish findings, and make criminal referrals, but only prosecutors and grand juries can bring charges.
Can a former official be impeached? The Senate has twice concluded that it may try a former official: Secretary of War William Belknap in 1876 and former President Trump in 2021. The question has not been decided by a court.
Is this analysis partisan? No. The constitutional rules described here apply to every President and every civil officer, regardless of party.
This post is provided for public education by the Biazzo Law Government Oversight Program. It is not legal advice and does not create an attorney-client relationship. It describes the law and pending matters as of November 3, 2026. Descriptions of possible criminal exposure are legal analysis, not accusations. No court has found that the President committed a crime during his second term, and every person is presumed innocent unless and until proven guilty in a court of law.
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