I'd bet you a donut the GOP will ask for a redo of the entire election in that state if things don't turn out their way.
I think they should do it no matter the outcome. If a state can't prove that only alive eligible citizens have voted - then the state have no right to claim that the results are valid.
If a candidate makes a totally false claim in the media should the election be invalid until every voter can prove that they have got the correct brain wash? Obviously not. There is no way to undo the damage from the false claim. So the results will be valid as long as election laws are followed and any dispute can be adjudicated in the courts.