If I am understanding this situation correctly, the 'establishment' GOP, aka RINO's are going against the leader of their own party. That doesn't set well with me. This is not what the people voted for. IMHO Sessions is one of the 'leakers' and needs to go.
Nope, it looks like you aren't understanding that correctly. Congress is saying under their authority in the Constitution, that Congress has 'advise and consent' powers for all nominations and a restricting the Executive branch from going around that authority.
Congress made this point with Obama and our side cheered for it. (link upthread)
It is isn't a political party thing, it is a Constitution thing.