What evidence do you have that he is an American?
His actions are not those of an American, indeed while they are totally inconsistent with patriotism towards America, they are totally and universally and consistently aligned with islam, the caliphate and ummah.
His actions say quite, quite clearly that his legal status is not "American president", but "non-uniformed enemy combatant".
His actions are those we would expect of spies and saboteurs.