Not all of them, especially if they think Trump corrupted the investigation.
The FBI investigation into Trump Campaign-Russia was already going on for awhile, before Sessions was nominated - the Senators at his confirmation hearing even asked Sessions if he would recuse himself and he said he would - Trump could’ve told him then to drop out, he didn’t.
The point is that there NEVER SHOULD HAVE BEEN an “investigation”!
And but for Jeff Sessions, there wouldn’t be one.
He enabled this, and he continues to protect it.
Bingo.