Scandal: Affair with Monica Lewinsky
How he was outed: Recorded phone calls (between Lewinsky and a close friend)
In the early days of the Clinton-Lewinsky scandal, the most damning evidence was presented by Linda Tripp. A close friend and confidante of Monica Lewinsky, Tripp recorded her conversations with the White House intern — conversations that revealed intimate details of what Lewinsky said was a sexual affair with the President. It was these tapes that, when handed over to special prosecutor Kenneth Starr in 1998, led to the expansion of the investigation into Clinton and Lewinsky's supposed relationship, paving the way for an eventual impeachment vote by the House of Representatives.