Pittinger doesn't even do it well but as a result of Hayes playing by the rules of logic and TV host courtesy, he gives this lying ass face time on TV and an ability to pretend he hasn't approved of treason against the United States as he sits as a member of Congress. Which wouldn't be so terrible if it wasn't a party of such supporters of treason, from Paul Ryan and Mitch McConnell, down who are supporting and covering for the biggest traitors this country has ever known in the highest positions in government.
If they're not going to be more effective at nailing these liars they shouldn't give them face time. I've heard Republicans do this for decades and it is one of the reasons why live interviews of this kind, especially since the advent of cabloid 24-7 alleged news which has been such a boon for Republican liars. It's a real life example of the media being the message. When someone is lying you need to have enough control of the flow to point out they're lying as many times as needed, the same if what they're saying amounts to something as awful as supporting treason for political gain as Pittinger, Ryan and others have explicitly done while holding high office.