Impeachment is a formal accusation of misconduct brought by the U.S. House of Representatives against a sitting federal official. It works like a federal indictment: the House votes to charge, and the Senate then holds a trial to decide whether to convict and remove. So when people ask what impeachment means, the short answer is that it’s the charge, not the removal. A president or judge who has been impeached has been accused; they are only out of office if the Senate later convicts them by a two-thirds vote.
Only three presidents in American history have been impeached, and none has been convicted. The mechanism exists as the Constitution’s ultimate check on abuse of power by officials in the executive and judicial branches.
What Conduct Qualifies
The Constitution limits impeachment to three categories: treason, bribery, and “other high Crimes and Misdemeanors.”1Cornell Law Institute. Article II, U.S. Constitution – Section 4
Treason has a narrow constitutional definition: waging war against the United States or giving aid and comfort to its enemies. A conviction requires testimony from two witnesses to the same overt act, or a confession in open court.2Legal Information Institute. Treason Clause: Doctrine and Practice Bribery covers accepting or soliciting something of value in exchange for official action. Both are serious criminal offenses with clear legal boundaries.
“High Crimes and Misdemeanors” is deliberately broader. It does not require a violation of any federal criminal statute. It covers conduct that violates the public trust or represents a serious failure to fulfill the duties of office. The framers borrowed the phrase from English parliamentary practice, where it had long been used to address abuses of power that ordinary criminal law could not reach. In practice, Congress decides for itself what qualifies, and the working definition has shifted with political context over two centuries.
Who Can Be Impeached
The Constitution makes the President, Vice President, and “all civil Officers of the United States” subject to impeachment and removal.1Cornell Law Institute. Article II, U.S. Constitution – Section 4 Civil officers include federal judges with lifetime appointments, cabinet secretaries, and other principal officers appointed by the President and confirmed by the Senate. Most impeachment cases in U.S. history have actually involved federal judges, not presidents.3U.S. Senate. Impeachment Cases
Whether lower-ranking federal officials can be impeached has never been tested, because the House has never impeached anyone below the level of a principal officer.4Legal Information Institute. Offices Eligible for Impeachment Rank-and-file federal employees are clearly outside the process.
Two groups are outside it entirely. Military personnel fall under the Uniform Code of Military Justice and its court-martial system.5Department of Defense – Judge Advocate General’s Corps. Uniform Code of Military Justice Members of Congress are not “civil officers” for impeachment purposes; each chamber disciplines its own members, and can expel a sitting member by a two-thirds vote under a separate constitutional provision.6Library of Congress. Article I, Section 5, Clause 2
How the House Brings Charges
The Constitution gives the House “sole Power of Impeachment.”7Cornell Law School. The Power of Impeachment: Overview The process usually begins in the House Judiciary Committee, which investigates allegations, issues subpoenas for documents and testimony, and builds a factual record. Before a full-scale investigation, the committee typically seeks authorization from the full House to open a formal impeachment inquiry, which requires a majority vote.8Legal Information Institute. Impeachment
If the investigation produces enough evidence, the committee drafts specific charges called Articles of Impeachment. Each article spells out a distinct act of alleged misconduct. The committee votes on whether to send the articles to the full House, and the House then votes on each article individually. A simple majority is enough to impeach.
That vote does not remove anyone. It formally charges the official and sends the case to the Senate. The House also appoints a team of managers, selected by the Speaker, who act as prosecutors during the Senate trial. They present the evidence, question witnesses, and argue for removal.
How the Senate Trial Works
Once the House impeaches, the Senate holds a trial that looks more like a courtroom proceeding than a legislative debate. Senators sit under oath or affirmation, and the accused has the right to legal counsel, to present a defense, and to cross-examine witnesses.9Library of Congress. Article I, Section 3, Clause 6 – Historical Background on Impeachment Trials The Senate follows its own procedural rules for impeachment, originally adopted in the 1800s and last revised in 1986.10GovInfo. Rules of Procedure and Practice in the Senate When Sitting on Impeachment Trials
Who presides depends on who’s on trial. When the President is the defendant, the Chief Justice of the Supreme Court takes the chair. For any other official, the Vice President or the President Pro Tempore of the Senate presides. The reason is straightforward: the Vice President has a personal stake in the outcome of a presidential trial and would face a clear conflict of interest.9Library of Congress. Article I, Section 3, Clause 6 – Historical Background on Impeachment Trials
Conviction requires a two-thirds supermajority of the Senators present, on at least one article.9Library of Congress. Article I, Section 3, Clause 6 – Historical Background on Impeachment Trials That is an intentionally high bar. The framers wanted removal to require broad bipartisan consensus, not a bare partisan majority. If no article reaches two-thirds, the official is acquitted and stays in office.
What Conviction Actually Does
The Constitution caps the penalties from an impeachment conviction at two: removal from office and, optionally, disqualification from holding future federal office.11Cornell Law Institute. U.S. Constitution Annotated Article I, Section 3, Clause 7 – Overview of Impeachment Judgments There are no fines and no prison time. Impeachment is a political process, not a criminal one.
Removal Is Automatic and Final
Removal takes effect immediately upon conviction. It cannot be reversed by executive pardon. Federal courts will not review the Senate’s verdict either. In Nixon v. United States (1993), the Supreme Court held that impeachment presents a “political question” that lies outside the judiciary’s reach.12Justia. Nixon v. United States, 506 U.S. 224 (1993) Once the Senate convicts, that’s the last word.
Disqualification Is a Separate Vote
After voting to convict, the Senate may hold a separate vote to permanently bar the individual from any future federal office. This disqualification vote requires only a simple majority. The Senate has imposed disqualification in some judicial impeachments; it has never had the chance to do so for a president, because no president has ever been convicted.13U.S. Senate. About Impeachment
Criminal Prosecution Can Still Follow
The Constitution preserves the possibility of criminal prosecution after removal. A convicted official “shall nevertheless be liable and subject to Indictment, Trial, Judgment and Punishment, according to Law.”11Cornell Law Institute. U.S. Constitution Annotated Article I, Section 3, Clause 7 – Overview of Impeachment Judgments Federal or state prosecutors can bring charges for the same conduct in a regular court, and double jeopardy does not apply because impeachment is not a criminal proceeding.
The Pardon Limit
The presidential pardon power is broad, but the Constitution carves out one absolute limit: the President cannot pardon anyone “in Cases of Impeachment.”14Library of Congress. Article II, Section 2, U.S. Constitution A President cannot pardon an official to block impeachment or undo a Senate conviction. The Supreme Court has described the pardon power as “unlimited” outside this one exception.15Legal Information Institute. Overview of Pardon Power A President could still pardon a removed official for the underlying criminal conduct, because that pardon would apply to the criminal case, not the impeachment.
Loss of the Presidential Pension
A president removed through impeachment would also lose the lifetime pension and office allowances under the Former Presidents Act. The statute defines a “former President” as someone whose service “terminated other than by removal pursuant to section 4 of article II of the Constitution.”16National Archives. Former Presidents Act Secret Service protection is authorized under a different statute that does not use that definition, and legal scholars have concluded a removed president would likely keep protection, though the question has never been tested.
How Often It Has Happened
The House has impeached 22 federal officials since 1789, and most have been federal judges.
- Convicted and removed: eight federal judges, including Harry Claiborne (1986), Alcee Hastings (1989), Walter Nixon (1989), and G. Thomas Porteous (2010).
- Acquitted: three presidents (Andrew Johnson in 1868, Bill Clinton in 1999, and Donald Trump in both 2020 and 2021), along with several judges and one Supreme Court Justice, Samuel Chase, in 1805.
- Resigned before trial: several officials, including Secretary of War William Belknap (1876) and Judge Samuel Kent (2009).
- Charges dismissed: in 2024, the Senate dismissed the impeachment charges against Secretary of Homeland Security Alejandro Mayorkas.
No president has ever been convicted and removed from office.3U.S. Senate. Impeachment Cases The closest call was Andrew Johnson, who survived by a single vote. Donald Trump is the only official ever impeached twice.