Acting as an un-registered agent of a foreign government. (Mexican invasion enablement and attacks on states and officers, offshore drilling ban for benefit of Saudis)
Criminal negligence (causing Afghan war causalities to skyrocket under his RoE, placing provable incompetents and traitors in positions of authority) .
Dereliction of duty (All vacation, all the time).
And the kicker: Fraud due to ineligibility to hold office.
Frowning takes 68 muscles.
Smiling takes 6.
Pulling this trigger takes 2.
I'm lazy.