Supreme Court Upholds State Mail-in Ballot Rules, Rejecting GOP Challenge Ahead of 2026 Midterms

The Decision

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 justices also upheld state laws that count mail ballots that arrive after Election Day, an unexpected rebuff of Trump's longstanding attacks on mail-in voting. The Supreme Court ruled 5-4 that states may count mail-in ballots received after Election Day if they were mailed on time, preserving rules in Mississippi and other jurisdictions ahead of the midterms.

Significance

The ruling is particularly significant as it comes ahead of the 2026 midterm elections, when control of Congress will be decided. GOP lawmakers fear President Trump is out of sync with them and many American voters on the economy, the biggest issue of the 2026 midterm elections. The mail-in ballot decision represents a rare instance where the conservative-majority court sided against Trump's broader efforts to restrict voting access through mail-in ballots.

Electoral Impact

The decision ensures that millions of voters who rely on mail-in voting will have their ballots counted even if processing delays cause them to arrive after Election Day, provided they were mailed by the deadline. This preserves voting access rules that have been in place in various jurisdictions and protects the participation of voters who depend on mail balloting, including military personnel abroad, elderly voters, and those with mobility challenges.

Context

The ruling came the same day the Court issued multiple decisions on executive power, marking a complex term for the Trump administration. While the Court expanded Trump's power to remove members of some independent agencies, it blocked him from firing Federal Reserve Governor Lisa Cook and upheld protections for mail-in voters.