How Impeachment Works: The Constitutional Process for Removing Officials
Impeachment gets treated in headlines like a criminal indictment, but the Constitution built it as something closer to a political no-confidence procedure with a legal vocabulary. Two chambers, two very different jobs, and a threshold so high that most impeachments never end in removal at all.
Published July 6, 2026Impeachment Is Political, Not Criminal
An impeached official has not been convicted of a crime in the way that word is normally used. Impeachment is a constitutional mechanism for removing a federal officeholder from office, full stop — it does not carry jail time, fines, or a criminal record on its own. A person can be impeached and removed and still never be charged with a crime in an ordinary court, and a person can be acquitted by the Senate and later face criminal charges for the same conduct in a separate proceeding. The two tracks run independently, which is part of why the process confuses people who expect it to work like a trial they have seen on television.
The framers borrowed the structure from English parliamentary practice but narrowed it considerably. Where Parliament could impeach anyone for almost any reason, the Constitution restricts federal impeachment to the president, vice president, and civil officers of the United States, and it limits the grounds to treason, bribery, or “other high crimes and misdemeanors.”
What Counts as an Impeachable Offense
“High crimes and misdemeanors” is not defined anywhere in the Constitution, and that ambiguity is deliberate rather than an oversight. At the Constitutional Convention, George Mason pushed to add the phrase after objecting that treason and bribery alone would not cover abuses of power that fell short of literal crimes. The historical understanding, drawn from British precedent, treats the phrase as covering serious breaches of the public trust connected to the office itself — corruption, abuse of power, obstruction of legitimate oversight — rather than ordinary criminal violations unrelated to official duties.
In practice, the standard gets decided anew each time by the House majority that drafts the articles of impeachment and the two-thirds of senators who vote on conviction. That built-in flexibility is a feature, not a bug, of a mechanism aimed at political accountability rather than criminal punishment.
The House Investigates and Votes to Impeach
Impeachment proceedings usually begin in a House committee, most often Judiciary, which can open an inquiry, subpoena witnesses and documents, and hold hearings. If the committee votes to recommend impeachment, it drafts one or more articles of impeachment, each stating a specific charge. The full House then debates and votes on each article separately. A simple majority is enough to impeach — this is the equivalent of a grand jury returning an indictment, not a conviction. Impeachment by the House means only that the official has been formally charged and the case moves to the Senate.
The Senate Holds Trial
Once the House impeaches, House members called managers present the case to the Senate, which sits as a court of impeachment. The Chief Justice of the United States presides when a sitting president is on trial; the vice president or the Senate president pro tempore presides for other officials. Senators are sworn to render impartial justice, witnesses can be called, and the accused official is entitled to legal counsel and the chance to mount a defense.
Conviction requires a two-thirds vote of senators present — typically 67 of 100 — a threshold set deliberately high so that removal would require support well beyond a single party's majority. If convicted, the official is immediately removed from office. The Senate can also vote separately, by simple majority, to disqualify the person from holding future federal office, a penalty that has been applied to a handful of federal judges even after their removal.
Why Removal Almost Never Happens
The two-thirds bar means conviction generally requires senators to break from their own party in large numbers, something that happens rarely in an era of tight partisan alignment. Three presidents have been impeached by the House; none has been convicted by the Senate. Andrew Johnson survived by a single vote in 1868. Bill Clinton was acquitted on both articles in 1999. Donald Trump was acquitted twice, in 2020 and 2021. Richard Nixon resigned in 1974 before a House vote could take place, once it became clear that impeachment and conviction were both likely.
Federal judges present a different pattern. Because judges hold lifetime appointments and lack the political base of an elected president, the Senate has convicted and removed several — a reminder that the process is not toothless, just calibrated to be difficult against officials with independent political standing. For more on how removal fits alongside the broader system of institutional restraint, see how checks and balances operate across the three branches.
State and Local Impeachment
Every state constitution includes its own impeachment provision for governors, judges, and other state officers, and the mechanics vary. Most states follow the federal template — a lower house impeaches, an upper house tries the case — but some states use different vote thresholds or route trials through the state supreme court instead of the legislature. Governors have been impeached and removed in states including Illinois and Missouri, and the pattern below the federal level shows the mechanism working as originally intended: a check available to a legislature when normal political processes cannot resolve serious misconduct in office. The structural logic mirrors separation of powers at the state level, giving each branch a defined role and preventing any single officeholder from being unaccountable to the others.
The Office of the Historian at the U.S. House of Representatives maintains detailed historical records of every federal impeachment proceeding, including vote counts and the specific articles filed, for readers who want the primary documentation rather than a summary.