News broke late Thursday of a massive Israeli strike that killed several top Iranian military leaders and targeted key facilities. Secretary of State Marco Rubio scrambled to clarify the U.S. position, insisting the attack was a unilateral move by Israel and that America had no direct involvement. But Trump was already on the phone with a handpicked group of journalists, offering a very different message. He praised the strikes as “excellent,” made clear the U.S. had foreknowledge, and didn’t bother with diplomatic ambiguity. The U.S. didn’t pull the trigger — but Trump was riding shotgun, playing the eager sidekick without...