I think we can see where this is leading: “let them enforce it” Ever since Justice it was understood that the ultimate interpreter of the executive’s “legitimate power” under the Constitution (specifically Article II) was the Supreme Court. I think we’re about to see that concept contested, which has kept our system more or less stable short of civil war, in a way we’ve never seen. It could be the whole ballgame. By the way, Elon responded to that tweet: The gall.