Trump's knowledge base is as deep as the bottom of the Mariana Trench, but it is as only as wide as one lane in an olympic sized swimming pool. He is easily tricked and influenced, and got into the game too late to learn who to delegate to and how. That is why he picks LOSERS and family grifters and their schmendrick spouses to talk him into some things and out of others.
Mostly the Republican establishment abandoned him when he kicked the hell out of Jeb Bush, their pick for a “make no waves everybody gets paid” Presidency. He was left to himself to vet his own Administration, beginning the night EVERYONE thought he’d lose.
^^