The history of impeachments in the US shows what a dubious distinction Donald Trump enjoys, with two out of all five the nation's legislators have undertaken.
In the first two centuries of the United States government, the House of Representatives conducted only two presidential impeachment proceedings.
By the time the sun set on Wednesday, it had conducted three in just 25 years – with two of them in the past year and a half, against the first President ever to be impeached twice.
