He doesn’t have any...
Because you cannot impeach an illegitimate president.
You can arrest him for fraud and treason though.
Plenty of those to list.
You can impeach the current office holder, whether he’s there legitimately or illegitimately. Lead the way on it if you disagree, and I’ll follow and support your efforts. I’ll be working on this with whomever’s interested and you’re invited to support it.