An impeachment process against Richard Nixon began in the United States House of Representatives on October 30, 1973, following the “Saturday Night Massacre” episode of the Watergate scandal.The House Judiciary Committee set up an impeachment inquiry staff and began investigations into possible impeachable offenses by Richard Nixon, the 37th President of the United States.
https://en.wikipedia.org/wiki/Impeachment_process_against_Richard_Nixon

