The House of Representatives impeached President Donald Trump following a whistleblower scandal involving a Trump call to the leader of Ukraine, and his trial is currently underway in the Senate.

Congress holds the Constitutional power to charge federal officials with crimes and remove them from office.

In US history, just 19 federal officials — one senator, one cabinet secretary, three presidents, and 15 judges — were impeached.

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In a historic move on December 18, the House of Representatives impeached President Donald Trump.

In US history, just 20 federal officials — one senator, one Cabinet secretary, three presidents, and 15 judges — were impeached. Of those impeachments, just seven have occurred in the past 80 years.

President Richard Nixon, the only president to resign from office, was actually never impeached. He stepped down before proceedings had begun. The two presidents who were impeached by the House, Bill Clinton and Andrew Johnson, were both acquitted by the Senate. No president has ever been convicted by the Senate.

Here are the stories behind the 20 federal officials who were impeached in US history:

An earlier version of this article was written by Allan Smith.