This is a man who hates being a Republican. Who is so overcome with TDS that he actually thinks the Democrats will give a fair, impartial, focused-on-the-facts, investigation without any Republicans?
No; of course he doesn't believe that. He knows better. He just hates Trump so badly that he doesn't care and is perfectly willing to lie and to do it in such a fashion that he knows that everyone else knows he's lying. That's the problem with derangement; you just don't care about anything else except that which consumes you.