Who can enforce the law against a sitting President. Whose job is it?
The founding fathers very wisely gave the "power of the purse" to the HOR, whose members have the closest contact with US citizens in their district. A "conservative" HOR was elected to exercise that power. They've failed us totally.
Believe it or not, Newt knows the legal remedies for an out of control POTUS, as well as a rogue court such as the 9th Circus. He has written on the subject, giving precedents when it was actually done. Whether, if in a position of authority, he would have the stones go DO it is another subject.