Monday’s arguments will center on whether the case should be decided by state or federal courts — a decision which could be crucial in whether the results of the race are ultimately overturned.

The lawsuit is proceeding in state and federal court at the same time, a rare occurrence that mirrors the rare nature of the attempt to throw out ballots months after the election ended.

The 4th U.S. Circuit Court of Appeals will hear arguments Monday about whether federal or state courts should handle the case.