Clearly he though he did, until a few hours ago. Who are we to second-guess President Trump? He knows best.
Obviously he didn't in this case.
He and POTUS go back a ways, POTUS probably thought he’d be good, but clearly he couldn’t handle the position or himself properly. When things go wrong you adjust. Scaramucci was toxic once he was appointed by POTUS. Attacking Bannon, shooting off his mouth to the left wing media using foul language, and this was within 24 hours of getting the job.
POTUS is smart and working hard for our side but he’s not perfect. He made a mistake appointing someone he thought he knew. Now he’s gone...we move on. It’s not a big deal imo