Alexander Hamilton wrote that “energy in the executive” is “essential to the protection of the community against foreign attacks,” which is why the Constitution grants the President broad authority over national security. The question for the Supreme Court on Wednesday in Trump v. Hawaii is whether judges can usurp this core executive power.
President Trump has issued three orders suspending admission into the U.S. from certain countries to protect national security. The first two were enjoined by lower courts. Hawaii is...