The Trump administration’s proposal to crack down on voting by mail in federal elections – articulated in a March 2026 executive order – faces its toughest legal test so far, as the Supreme Court decides whether to allow the measure to go ahead, or maintains a lower court’s block on its implementation.

Despite offering no evidence of widespread fraud, the White House has said the many measures it wants to put in place will “enhance election integrity via the United States Mail.” Those measures include using the Department of Homeland Security, the U.S. Postal Service and the Department of Justice to vet the eligibility of voters, establish new standards for mail ballots and who can use them, and investigate and prosecute any state and local officials who issue federal ballots to ineligible voters, including noncitizens.

Two major lawsuits were filed to stop the administration from carrying out plans related to the Postal Service. The lawsuits say the plans would result in widespread disenfranchisement and that the administration had no constitutionally granted authority to interfere in how states run elections.

The cases have worked their way through lower courts, and now the Supreme Court is considering the plans for the second time, having allowed them on Aug. 24, 2026, to go ahead in a technical decision that did not deal with the substance of the administration’s plans. A federal court then issued an injunction to stop the rollout of the Postal Service plans, and after the Trump administration appealed that injunction, the Supreme Court is now, finally, considering whether the injunction should be........

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