Sessions was an outspoken supporter of Trump when he was running for president. What caused him to turn his coat? Blackmail? The promise of some sort of financial reward?
Yeah, that’s a good question.
Nothing caused him to "turn coat." He was a decoy, to throw the Deep State off track while he hired investigators to do the work behind the scenes with no leaks. Huber, Durham, and Barr are about to release their reports soon and it's all thanks to Sessions' due diligence and not camera-hogging walking perps like FReepers want him to do.
Charades baby, charades. HE was deep state plant before he even was nominated.