Richard Nixon is best remembered as the only president ever to resign from office. Nixon resigned on August 9, 1974, to avoid certain impeachment in the House of Representatives and a certain conviction by the Senate, over attempting to cover up illegal activities by his administration in the Watergate scandal.
The House Judiciary Committee approved three articles of impeachment against Nixon, for obstruction of justice, abuse of power, and contempt of Congress.
Likewise, “Congress has sufficient grounds to hold President Trump to account for obstruction of justice. The proper means for holding him to account is an impeachment process, one that is informed by lessons from the Congress that sought to hold Richard Nixon to account after his Watergate-era wrongdoing was revealed. That’s not a radical construct. That’s a historical construct. And it is entirely relevant to the moment in which the United States finds itself today. Former director of national intelligence James Clapper said,“Watergate pales really in my view compared to what we’re confronting now,” -- The Nation
Robert Reich says the parallel between Nixon and Trump is almost exact.