A decision against such ballots could have upended election procedures in states across the country ahead of the midterm elections.

The Supreme Court on Monday ruled that states can count mail ballots that are cast by Election Day but arrive later, rejecting a GOP challenge to a Mississippi law.

The Supreme Court on Monday upheld Mississippi’s mail-in ballot law that allows absentee ballots to be counted up to five days past Election Day.

Justice Amy Coney Barrett joined the court’s liberal justices and Chief Justice John Roberts in rejecting a GOP challenge to post-Election Day ballot receipt deadlines.

WASHINGTON — The Supreme Court upheld a Mississippi law allowing mail-in ballots postmarked by Election Day to be counted up ...