The Republican National Committee wants to toss ballots arriving after Election Day. Critics say thousands of votes — a majority cast by Democrats — are at stake.
The Supreme Court will consider whether states can count mail ballots that are postmarked by Election Day but arrive after.
Voters will decide over 30 races, including a nationally watched battle between John Cornyn and Ken Paxton. The registration deadline is April 27, and early voting is May 18–22.