As vote counting continues this week in Pennsylvania’s tight Senate race, attention is once again shifting toward the largest and most hotly contested tranche of remaining votes that could help Democratic Sen.

The ruling ordered county election boards, listing Bucks, Montgomery and Philadelphia counties specifically, to only count legal ballots that comply with the state’s election code. It isn’t the first time this election cycle that the Pennsylvania Supreme Court has ruled only ballots in compliance with the law can be counted.