The Supreme Court rejected the President Donald Trump administration's request to immediately enforce new U.S. Postal Service requirements for federal election ballot mail ahead of the 2026 midterm elections.

Supreme Court Blocks USPS Ballot Rules

On Monday, the court denied the government's application to stay a lower court's nationwide preliminary injunction blocking the USPS rule.

The rule requires federal ballot mail to include an election-mail logo, be compatible with high-speed scanning equipment and carry a voter-specific barcode.

States would also have to submit envelope designs for USPS review and provide basic voter information through a Postal Service portal.

"The Government is unlikely to succeed on the merits of its challenge to the District Court's preliminary injunction," the Supreme Court said.

Justice Brett Kavanaugh agreed with the decision but said USPS may have statutory authority to issue the rule.

However, he said applying it during the 2026 elections would be "arbitrary and capricious" because state and local election officials lacked enough time to implement it.

Trump Administration Faces Ballot Mail Setback

Justices Samuel Alito and Clarence Thomas dissented. Alito argued that USPS has broad authority to regulate mail and said the government had made the necessary showing for the stay.

Alito described the states' challenge as "essentially a Hail Mary pass" that "rarely succeeds."

Trump Tightened Mail Voting Rules

In March, Trump signed an executive order to tighten mail-in voting rules, including using federal data to verify voter eligibility and requiring absentee ballots to be sent only to voters on approved state lists.

The order also mandated secure ballot envelopes with unique tracking barcodes and drew immediate legal challenges from voting-rights groups and Democrats.

USPS Mail Voting Rules

Last month, USPS unveiled mail-in voting rules based on Trump's blocked March executive order.

The rules would have required states to provide citizenship-based voter lists before USPS could send ballots.

A federal judge later blocked key parts of the overhaul nationwide, ruling that the executive branch lacked authority to regulate elections.

U.S. District Judge Indira Talwani said states had primary authority over congressional election procedures and that Congress, not the president, could override those rules.

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