On the verge of an impeachment and removal from office amid the Watergate scandal, Richard Nixon became the first president of the United States to resign.

The impeachment process against President Richard Nixon was initiated by the United States House of Representatives on October 30, 1973, during the course of the Watergate scandal, when multiple resolutions calling for the impeachment of Nixon were introduced immediately following the series of high-level resignations and firings widely called the "Saturday Night Massacre". The House Committee on the Judiciary soon began an official investigation of the president's role in Watergate, and, in May 1974, commenced formal hearings on whether sufficient grounds existed to impeach Nixon of high crimes and misdemeanors under Article II, Section 4, of the United States Constitution. This investigation was undertaken one year after the United States Senate established the Select Committee on Presidential Campaign Activities to investigate the break-in at the Democratic National Committee headquarters at the Watergate office complex during the 1972 presidential election, and the Republican Nixon administration's attempted cover-up of its involvement; during those hearings the scope of the scandal became apparent and the existence of the Nixon White House tapes was revealed.