Supreme Court Blocks Mail-Ballot Restrictions as Midterm Voting Begins

The U.S. Supreme Court on September 14, 2026, declined to allow the U.S. Postal Service to carry out parts of a new rule on mail-in voting ahead of the 2026 midterms. The case was captioned Postal Service v. California, No. 26A305. The administration had sought emergency relief to implement portions of the rule while challenges moved through the lower courts. Supreme Court opinion

Only two justices dissented. Justices Samuel Alito and Clarence Thomas dissented from the denial. Justices Amy Coney Barrett and Neil Gorsuch, both nominated by Trump, did not dissent. Justice Brett Kavanaugh wrote a concurring opinion.

The rule at issue was published by the Postal Service on August 26, 2026, under the title "Ballot Mail for Federal Elections." It required ballot-mail envelopes to bear an election-mail logo and to be scannable. The Supreme Court declined to allow the Postal Service to carry out parts of that rule. SCOTUSblog

The rule traced to presidential action in March 2026. On March 31, 2026, President Donald Trump issued an executive order titled "Ensuring Citizenship Verification and Integrity in Federal Elections." The order required the Postal Service to transmit ballots only to individuals enrolled on a State-specific Mail-in and Absentee Participation List. White House fact sheet

Under the plan described in the litigation, the Postal Service would have been forbidden from delivering mailed ballots to voters the administration deemed ineligible. The Department of Homeland Security, working with the Social Security Administration, would have devised a list of supposedly ineligible, noncitizen voters. Almost a third of Americans vote by mail, giving any change to postal handling national scope. Guardian

Lower courts had already intervened. A U.S. appeals court declined to put on hold an injunction preventing the Postal Service from tightening rules around postal voting. On September 14, 2026, a second federal judge blocked the administration from implementing the new Postal Service rule on mail-in voting.

Timing mattered. North Carolina and Alabama were set to begin sending ballots to voters before September 10, 2026, with the earliest start on September 4. Alabama, North Carolina and Wisconsin had already begun mailing out ballots before the Supreme Court ruled.

Operational questions were raised inside the mail system. A Postal Service whistleblower told Congress in early September 2026 that the Postal Service lacked the ability to safely implement the restriction system. Senator Richard Blumenthal, who handled the complaint, described the plan as 'perilously rushed and potentially unlawful'.

Political contention continued after the ruling. Trump posted on Truth Social calling mailed ballots 'corrupt and out of control' and criticizing conservative justices who voted against him. Trump has attributed his 2020 presidential election loss to Joe Biden to fraud propagated through mailed ballots. Supporters of voting by mail rallied outside the U.S. Capitol in Washington, D.C., on September 15, 2026. Separately, six green card holders in Texas were charged as part of a federal crackdown on illegal voting.

The broader context here is a collision of election administration, postal logistics and judicial timing. The administration sought to condition ballot delivery on a federally assembled eligibility list, applied through state-specific participation lists and machine-readable envelopes. Opponents obtained injunctions before ballots moved, and the Court was asked to decide emergency requests while some ballots were already in voters' hands. The split on the Court, with two Trump appointees declining to join the dissent and Kavanaugh writing separately, points to disagreement not only over mail voting but over when federal rules can be imposed in an election already underway.

Looking at what this means for the midterms, the immediate question is procedural rather than final. The denial leaves the lower-court blocks in place for now. It does not resolve the underlying claims about citizenship verification, postal authority or state control of voter lists. With ballots already mailed in at least three states and further challenges possible, election officials, postal managers and litigants face parallel tracks of administration and adjudication that will continue past September 14.