It’s impossible to say, of course. The prospect of American military leaders responding to a presidential order with open defiance is frightening — but so, too, is the prospect of military obedience to an insane order. After all, military officers swear to protect and defend the Constitution of the United States, not the president. For the first time in my life, I can imagine plausible scenarios in which senior military officials might simply tell the president: “No, sir. We’re not doing that,” to thunderous applause from the New York Times editorial board.