He settled a harassment lawsuit, which is not always an admission of guilt for a high profile public figure. These things can be settled to keep them out of a media firestorm, despite the fact the Rats will fight anytime they think they can get off.
Which implies she had him dead to rights. The main issue is he did it with taxpayer money, and that's reason enough to go for me.
But the other is why are there not hearings scheduled and expulsion considered, since apparently the mere accusation of such is enough.