In the United States, presidents can be removed from office by either impeachment or the U.S. Constitution's 25th Amendment. Donald Trump is the only president in U.S. history who was impeached twice, but he was acquitted in both of his U.S. Senate trials. And the 25th Amendment hasn't been used to remove Trump from office, although law professor Kimberly Wehle believes that it should be.Wehle, who teaches law at the University of Baltimore and …