Supreme Court to hear major challenge to mail

WASHINGTON — The Supreme Court said on Monday that it would hear a challenge to Mississippi’s counting of mail-in ballots received after Election Day, a case that could upend mail-in ballot rules in dozens of states, creating chaos leading up to the 2026 elections.

The case, a potential blockbuster that asks the justices to determine the meaning of “Election Day,” adds another high-profile fight over elections and voting rights to the court’s term. Already, the court’s docket includes a lawsuit over who can sue to challenge Illinois’ mail-in ballot rules and a battle over the Louisiana congressional district map that could gut a remaining pillar of the Voting Rights Act.

In the case, Watson v. Republican National Committee, Mississippi argued that Congress set only the date by when voter