Barr is not necessarily a sycophant either. Barr truly believes in the power of the unitary executive and in the enforcement of hierarchy. He was one of the major proponents of mass incarceration of people of color. He supported GHW Bush in covering for Reagan's crimes during Iran-Contra.
Barr is many things but he isn't really a follower. He is a man on a mission, who saw that Trump's motives aligned in a certain way, with his own. If there is a problem (which I doubt) between the two right now, it is that Trump is so self serving and stupid, that it gets in the way of Barr's agenda of establishing an executive branch above the law. Trump just wants to shout it from the roof tops. He likes to commit crime and brag about getting away with it. Barr is used to slightly smarter criminals who maintain an air of plausible deniability.
Most of the people that Trump has actually chosen for positions are scumbags. He inherited people as career workers in departments but clashed with them immediately (think Sally Yates). He chose Flynn. He chose Kelly. He chose Spicer, Huckabee-Sanders, and Scaramucci. He chose Manafort. He chose Stone.
If Barr resigns, Trump will pick another scumbag to replace Barr. One thing though, is that the likely choice will be someone who is not as adept at being a weasel like Barr who was given the benefit of the doubt by Washington people because he was a former Attorney General and didn't get the scrutiny he deserved for Iran-Contra. He is a Washington operator though and Trump is running out of those.
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