The U.S. Supreme Court has rejected the Trump administration’s attempt to change federal rules governing mail-in voting, delivering a major setback to the administration ahead of the 2026 midterm elections.

Supreme Court Blocks Mail-Voting Changes

The court’s decision prevents the administration from putting its proposed changes to the mail-in ballot system into effect for this year’s elections. The changes stemmed from an executive order issued by President Donald Trump and faced legal challenges from states and voting-related groups.

The proposed rules would have introduced a uniform ballot-envelope system and required states to submit voter information through a federal portal. The Postal Service could also have refused to deliver ballots from states that did not comply.

Major Issue Ahead of Midterm Elections

The ruling comes as states are already preparing for the 2026 U.S. midterm elections, making the timing particularly significant for election officials and voters.

States including California and Oregon rely heavily on voting by mail, and election administrators had warned that changes so close to the election could create uncertainty for voters and election workers.

Trump Administration Faces Election Policy Setback

The Supreme Court decision represents another major legal development in the administration’s efforts to reshape U.S. election rules and voting procedures.

Election officials now have greater clarity as preparations continue, while the broader political debate over mail-in voting, federal election authority and election security is expected to remain a major issue through the midterm campaign.