Which two U.S. Presidents were fully impeached?

The two U.S. Presidents who were fully impeached are Andrew Johnson and Bill Clinton. Impeachment is a process established by the Constitution and refers to the formal accusation of wrongdoing by a President, which can lead to removal from office.

Andrew Johnson, who served after Abraham Lincoln, was impeached in 1868 primarily due to his violation of the Tenure of Office Act, among other accusations. His impeachment proceeded to the Senate, where he was acquitted by just one vote and ultimately remained in office.

Bill Clinton was impeached in 1998, primarily for perjury and obstruction of justice related to his extramarital affair with Monica Lewinsky. Like Johnson, Clinton was also acquitted by the Senate, which resulted in his remaining in office.

The other options include Presidents who were either not impeached at all (like George W. Bush and Ronald Reagan) or were not impeached despite controversies. Richard Nixon resigned before he could face impeachment proceedings, thus not completing the impeachment process. These details underscore how the impeachment process is distinct and applies specifically to those who have faced formal charges resulting in impeachment by the House of Representatives.