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: