The Supreme Court is set to hear a significant case regarding mail-in ballots, focusing on whether states can count ballots that arrive after Election Day. This case, highlighted by Republican challenges, could impose new limitations on mail-in voting and has drawn attention due to its implications for election law nationwide. The justices will also consider if ballots must be received by Election Day, amidst a backdrop of legal disputes that highlight differing state practices regarding mail-in voting. This scrutiny comes at a time when the counting of late-arriving ballots has become a contentious issue.