Well, that didn't take long.

Less than four months into Donald Trump's presidency, members of Congress are tossing around the word "impeachment." The British tabloids gush headlines such as, "Will he be impeached?" Bookies there put the odds at 33%.

It's a term — and a process — with a rich and ignominious history.

Two presidents have been impeached, and neither was convicted. A third resigned in disgrace rather than face near-certain conviction. Only eight people have been impeached in the House and convicted in the Senate — all federal judges.