[jpp113]

Violation of Separation of Powers - the legislative branch cannot legitimately usurp the executive branch powers, i.e. law enforcement - by acting as a grand jury in a non-impeachment case.

They have not usurped Article 3 judicial branch powers....yet.
Schifty Schitt will attempt it eventually though

[Observator]

They have not usurped Article 3 judicial branch powers....yet.

There is that. Trying to boil down the rest of this word salad, his other contention seems to be that all the members of the committee have said mean things about Trump in the past. Not sure how far that's going to get him.