FILE – In this May 28, 2020, file photo processing work on mail in ballots for the Pennsylvania Primary election is being done at the Butler County Bureau of Elections, in Butler, Pa. With concerns rising in Pennsylvania that tens of thousands of mail-in ballots will be discarded in the presidential election over technicalities, officials in the battleground state told counties that they aren’t allowed to reject a ballot solely because an election official believes a signature doesn’t match the signature in the voters file. (AP Photo/Keith Srakocic, File)
The Pennsylvania Supreme Court dealt a blow Thursday to Republicans in the legal fight over the deadline for mailed ballots in the presidential battleground state.