IF he is not a US citizen, what treason can he be guilty of, since he does not have any duty of allegiance?  Of course, he took an oath, several times. So,.... at the very least he perjured himself, defrauded the US, committed act of domestic terror, RICO title 18 charges on many counts apply, aided and abetted the enemies of the US, drug consumption/ trafficking charges, conspiracy to substance abuse, killing US citizens without due process of law, mail fraud, election fraud,  I dunno, the whole criminal code I would suppose.