Final answer:
The officeholders who have most often been impeached and removed by Congress are presidents.
Step-by-step explanation:
In the history of the United States, the officeholders who have most often been impeached and removed by Congress are presidents. Only three presidents have ever been impeached: Andrew Johnson in 1868, Bill Clinton in 1998, and Donald Trump in 2019 and again in 2021. However, none of them were ultimately removed from office.
Learn more about Political impeachment in the United States