Impeachment
Two well-known heads of state who were impeached and removed from office were Brazilian president Dilma Rousseff in 2016 and South Korean president Park Geun-hye in 2017. Three American presidents were impeached: Andrew Johnson, Bill Clinton and Donald Trump, Donald Trump was officially impeached two separate times by the house of representatives. None were removed from office. President Richard Nixon resigned from the office of President before the House could impeach him, resulting in him being the only U.S. president to resign.