On August 5, 1974, the long sought after audio tapes provided the "smoking gun" which revealed President Nixon had been deeply involved in the coverup and had ordered Haldeman to halt the FBI investigation just six days after the Watergate break-in."...call the FBI and say that we wish, for the country, don't go any further into this case, period..." -- Nixon to Haldeman, June 23, 1972.)
That revelation resulted in a complete collapse of support for Nixon in Congress. On Friday,
August 9, Nixon resigned the presidency and avoided the likely prospect of losing the impeachment vote in the full House and a subsequent trial in the Senate. He thus became the only U.S. President ever to resign. Vice President Gerald R. Ford succeeded him and a month later granted Nixon a full pardon for any crimes he might have committed while President.
Richard Nixon had served a total of 2,026 days as the 37th President of the United States. He left office with 2 1/2 years of his second term remaining. A total of 25 officials from his administration, including four cabinet members, were eventually convicted and imprisoned for various crimes.