I think it’s simple:

Bill was a decent president (relatively speaking) but all of his legacy is tied to that BJ incident.

He really doesn’t like that and wants some kind of event in which a lot of powerful people look worse or just as bad as him.

So if there is little on him or if there is some stuff but it’s not the worse, then he can come up on top by making his legacy about the one who shined a light on all this stuff.

It’s a win win for him unless he was worse than trump.