The U.S. Supreme Court has declined to lift a judicial injunction blocking a new U.S. Postal Service rule that would have imposed stricter standards on mail-in voting ahead of the November 2026 midterm elections. This rule, initiated by an executive order from President Donald Trump earlier this year, required changes such as new ballot envelope designs and the creation of voter eligibility lists for mail ballots. The injunction was issued by a federal court in Boston, and the Supreme Court’s refusal means the rule will not be in effect for the upcoming national elections, which are critical in determining control of Congress.

The Court’s decision, issued without a full opinion, indicated that the Trump administration is unlikely to succeed in its challenge against the lower court’s preliminary injunction. Justice Brett Kavanaugh, a Trump appointee, supported the decision, acknowledging the Postal Service may have the authority to implement the rule but emphasizing the unfairness of enforcing it so close to the elections. Kavanaugh noted that election officials would not have enough time to adjust and comply with the new requirements, which would violate the Administrative Procedure Act.

Justices Samuel Alito and Clarence Thomas dissented from the majority’s decision, arguing the government has a strong interest in enforcing the Postal Service rule to enhance ballot security and detect election fraud. In his dissent, Alito also questioned the legal standing of some parties opposing the rule and emphasized the government’s need to maintain confidence in federal ballot mail operations. Meanwhile, legal and voting rights advocates praised the Court’s refusal, with the League of Women Voters and New York Attorney General Letitia James calling the move critical to preventing voter confusion and maintaining election integrity.

Although the Postal Service rule is blocked for the 2026 midterms, the Supreme Court’s stance leaves open the possibility that it could be implemented in future elections. The battle over mail-in voting rules continues to be a significant legal and political issue, especially as President Trump’s Republican Party holds narrow majorities in both the House and Senate ahead of the pivotal congressional races this fall. Voter groups stress the importance of stability and clarity in election processes to ensure every eligible ballot is counted.