White House aides are leaking that President Trump is considering a staff shakeup to stop them from leaking, and the casualty on Monday was communications director Mike Dubke. Mr. Trump certainly needs to fix his White House mess, but staff changes won’t matter unless the President accepts that he is the root of the dysfunction.

Mr. Dubke’s departure was rumored for weeks, though he’d been on the job for only three months. He wasn’t the problem, and his replacement won’t be the solution. It’s impossible to run a communications...