He'd never had to create that large of an administration before. It's not like a relatively small family business. He was inexperienced and he was just a bad judge of people to begin with.
Tell me, which party backed and supported an open borders globalist, who's daddy was a deep state kingpin, not once, but multiple times?
I've followed Trump for a while, and I get the inexperience part, but doggone, I really do believe he was presented a list and anyone not on the list wouldn't be confirmed. He may have questionable judgement of people from time to time, but not Sessions bad! Lol