Losing Nelson seat to Rick Scott really hurt.
Gardner may defect since he's up for re-election in Colorado. But then again, Doug Jones seat in AL is pretty much going to go back to (R). So I think he's going to stay away from impeachment talk unless it really really really really reaaaaaaally becomes obvious. He also may just do it because it's the right thing and he locked up KKK guys. If he knows he's not gonna win re-election in Alabama because it's too much of an uphill climb and Trump is still popular there he may just go out guns a blazing with middle fingers up.