The results of some 150,000 voters in Pennsylvania may not be finalized until as late as Friday after seven counties in the state said they won’t start counting mail-in ballots until the day after Election Day.

Staffing concerns in Beaver, Cumberland, Franklin, Greene, Juniata, Mercer, and Montour counties, all of which voted Republican in the last three elections, have forced election officials to hold off on counting mail-in ballots until Wednesday, according to NBC News.