Even if somebody pressed them on it, all they have to do is give a lie that appears credible.

Repubs: “Biden forced our hands in a secret meeting.”

Biden: “No, I didn’t.”

Repubs: “Yes you did. It’s your word against ours, and we already know Dems are lying cheaters, so…”

They don’t have to engage in good faith, because they aren’t interested in the truth.