Will Mr. Trump now stop listening to Mr. Bannon?

He needs to do so if he wants to hold the House and see his job approval rating improve before the midterms.

Mr. Bannon deserves credit for helping Mr. Trump earn his historic presidential election victory. But he has been a disaster in and around the White House.

A president needs competent political advisers — and Mr. Trump needs them now more than ever. It’s time to sideline Mr. Bannon.