High crimes and misdemeanors is putting it lightly:
In the months preceding the Joint Session, President Trump repeatedly issued false statements asserting that the Presidential election results were the product of widespread fraud and should not be accepted by the American people or certified by State or Federal officials. Shortly before the Joint Session commenced, President Trump addressed a crowd at the Ellipse in Washington, DC. There, he reiterated false claims that ‘‘we won this election, and we won it by a landslide’’. He also willfully made statements that, in context, encouraged—and foreseeably resulted in—lawless action at the Capitol, such as: ‘‘if you don’t fight like hell you’re not going to have a country anymore’’.
The evidence is overwhelming that Trump caused the attack to happen. Even before the election he was priming his lunatic followers to violently reject election results if he did not win, but that pre-attack rally was the straw that almost broke democracy's back. A pep rally before the big game, and that game was insurrection:
ARTICLE I: INCITEMENT OF INSURRECTION The Constitution provides that the House of Representatives ‘‘shall have the sole Power of Impeachment’’ and that the President ‘‘shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors’’.
Further, section 93 of the 14th Amendment to the Constitution prohibits any person who has ‘‘engaged in insurrection or rebellion against’’ the United States from ‘‘holding any office . . . under the United States’’. In his conduct while President of the United States—and in violation of his constitutional oath faithfully to execute the office of President of the United States and, to the best of his ability, preserve, protect, and defend the Constitution of the United States, and in violation of his constitutional duty to take care that the laws be faithfully executed—Donald John Trump engaged in high Crimes and Misdemeanors by inciting violence against the Government of the United States.
No doubt there will be further violence from Trump loyalists in the coming days, but that's what happens when you elect a narcissistic sociopath to our highest office.