You can’t read? He is the chairman of the Judiciary Committee. He controls who can be brought up, or if anyone can be brought up.
Kind of like McConnell controlling what comes up in the Senate.
And do you have any indication that Trump was scared off by this Grassley threat?
A tweet or any other Trump statement that he would fire Sessions if only mean old Grassley didn’t have him in a vice?
Or are you just guessing?