In future investigations, Congress needs to freeze all funding of government departments until they turn over all documents and cooperate. And throw all witnesses in jail for contempt if they refuse.
Don't be Silly, that would shut the government down Mitch already said he will never do that.
Once they ascend to the Throne they seem to forget past lawlessness of their predecessors, in the certain knowledge that the new King will do the same for them. It is a small elite club thing.
Sounds like a hell of a plan.