President Trump is just the fourth president to face impeachment proceedings. In 2016, The Post’s Presidential podcast examined the three presidents in that category before Trump. Here are their stories, beginning with Andrew Johnson.

Presidents who faced impeachment: Richard Nixon

Subscribe to follow The Washington Post’s coverage of impeachment proceedings with this collection of episodes from across The Post’s audio programming, including "Post Reports," "Can He Do That?" and "The Daily 202's Big Idea."