So this is the fundamental problem here: each state sets its own election laws. A state ruling in PA doesn't set precedent for a ruling in GA or AZ. What Trump is after - or was after, his heart doesn't seem to be in it anymore, this is really just being driven by you weirdos at this point - is a federal ruling that forces all states to declare the election results invalid DESPITE COMPLIANCE WITH THEIR OWN STATE ELECTION LAWS.
And that's just not going to happen. Election law is mostly a state and even a municipal thing - always has been.