They would get Biden on some kind of procedural issue like signing documents wrong. If they really wanted to be fun they'd argue Biden allows election interference from Israel, but that would probably alienate all the Republicans who take AIPAC money.

Point is that it wouldn't matter. They can say anything they want and manufacture whatever consent they please.

The only thing stopping Republicans from doing anything is the whims of capital. If capital would prefer Biden is removed from the ballot in some states, then it would happen .