Theoretically > "The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of,

Theoretically > "The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors." Practically it's all about politics The other impeachment was of Andrew Johnson who barely avoided conviction by one vote was also by radical republicans and also about politics. Although in their case they were radically pro civil rights for former slaves so I'm a lot more sympathetic. Still the law they passed to try to explicitly trip up Johnson (banning him from dismissing Lincoln's secretary of defense) was arguably unconstitutional. The reason Trump may not be impeached is because his party controls both houses of congress and they are afraid of the base. If his popularity craters finding a reason to impeach won't be that hard. The emoluments clause makes for an easy one (no proof of corruption needed just benefit, ultimatley congress is the judge). For other formal charges it may be my bias and low opinion but I have no doubt that if congressional investigations occur something about pre-election russian ties, corruption, or abuse of power will be found.