Impeachment first but then long imprisonment.
I hate the abuse of the word Treason but he is so very close.
Since no particular foreign government is solely responsible for this existential threat to The United States of America and Its Constitution, then Sedition is the proper term, at least for now IMHO for actively pursuing goals to destroy our country, values, liberty, and people. Not enough prisons for the perps.
Maybe we need a term that means the above hatred and poisonous actions with an end to nation-suicide, on behalf of ALL other nations since they want the same thing. Omni-Treason?