Four times in American history, decided whether to remove the president from office. All four times, Congress declined.
But the first round was the closest, as Congress considered the fate of Andrew Johnson, a Democrat made president by the death of Republican Abraham Lincoln.
What did Johnson do, or not do, to get Congress to draw up articles of impeachment?
The full story is told in Brenda Wineapple's book The Impeachers: The Trial of Andrew Johnson and the Dream of a Just Nation.
The author joined us in 2019, before either of Donald Trump's two impeachments.