MY PAPER ON MILITARY COUPS is getting more timely by leaps and bounds:

Well, the military swears an oath to the Constitution, which justifies ignoring unconstitutional orders. But so long as a President meets the Constitution’s requirements for age, residency, etc. there’s no such thing as an unconstitutional President. Announcing — or even determining — that you wouldn’t follow orders from a particular person holding the office, rather than that you wouldn’t follow illegal or unconstitutional orders, really is a sort of coup. It’s certainly not a fulfillment of an oath to uphold the Constitution.

By the way, my coups paper is still #1 on SSRN, and I guess it’s easy to see why.