The Supreme Court Just Left a New Mail-Ballot Rule Blocked for the 2026 Midterms

States running the 2026 midterms will keep using the mail-ballot procedures they already have. That is the practical effect of a one-page order the Supreme Court issued on September 14: the justices denied the Trump administration's request to lift a nationwide injunction, which means the Postal Service's new envelope and barcode rule for federal ballot mail stays blocked through the November election.

What the rule would have required

The rule at issue, published in late August as Ballot Mail for Federal Elections, 91 Fed. Reg. 54966, would have required federal ballot mail to carry three specific features: an election-mail logo, a design scannable by high-speed processing equipment, and a barcode unique to each individual voter. States would have had to design envelopes meeting those specifications, submit the designs to the Postal Service for review, and upload basic voter information to a Postal Service portal. Under the rule, the Postal Service would then screen outgoing and returning ballot mail for compliance; anything that failed would be rejected and sent back to the state to fix and resubmit, according to the rule text quoted in [Justice Alito's dissent](https://www.supremecourt.gov/opinions/25pdf/26a305_4g15.pdf).

How the case got here

The chain starts with an internal White House directive roughly five months before the September ruling, instructing the Postal Service to begin a rulemaking on election ballot mail, a directive described in [Justice Alito's dissent](https://www.supremecourt.gov/opinions/25pdf/26a305_4g15.pdf) as ordering the agency to "initiate a proposed rulemaking." A coalition of states led by California, along with several advocacy organizations, sued within days in federal district court in Massachusetts. U.S. District Judge Indira Talwani issued a temporary restraining order on August 27 and converted it to a nationwide preliminary injunction on September 4, finding, according to [JURIST](https://www.jurist.org/news/2026/09/us-supreme-court-rejects-doj-bid-to-stay-injunction-blocking-usps-mail-in-ballot-rule/), that immediate implementation "threatened the disenfranchisement of millions of voters." The administration asked the Supreme Court to pause Talwani's injunction two days later, and the Court denied that request on September 14, per [SCOTUSblog's](https://www.scotusblog.com/2026/09/trump-administration-again-appeals-mail-in-ballot-dispute-to-the-supreme-court/) tracking of the filings.

The concurrence: right on power, wrong on timing

Justice Kavanaugh's concurrence separates two questions the case raises and answers them differently. On whether the Postal Service has the statutory authority to write a rule like this at all, he wrote there is "at least a fair prospect that the final rule falls within the Postal Service's statutory authority," citing the agency's general rulemaking power under 39 U.S.C. Section 401(2). On whether the rule can apply to this specific election, he reached the opposite conclusion: applying it in the 2026 elections "would be arbitrary and capricious in violation of the Administrative Procedure Act because state and local election officials do not have sufficient time to reasonably implement the rule before the elections." That distinction is the reason the order blocks the rule for November without declaring the Postal Service powerless to issue something like it again on a longer runway.

“There is at least a fair prospect that the final rule falls within the Postal Service's statutory authority. But applying the rule in the 2026 elections would be arbitrary and capricious.”

The dissent: the states waited too long to complain about timing

Justice Alito's dissent, joined by Justice Thomas, argues the plaintiff states are relying on what the Court has previously called a "'Hail Mary pass' that 'rarely succeeds,'" the ultra vires legal theory states must use because Congress largely exempted the Postal Service from ordinary Administrative Procedure Act review. On the merits, Alito wrote the agency's broad statutory power to regulate mail collection, handling, and delivery makes it unlikely the rule is "entirely in excess" of that authority. On timing, his dissent puts the blame for the compressed schedule on the plaintiffs themselves, arguing that months of what he calls premature litigation over the President's original directive, and the weeks the Court itself spent drafting close to 40 pages of opinions on an earlier jurisdictional dispute in the same case, ate up the runway the government needed to implement the rule in an orderly way.

“The plaintiff States cannot claim the timing of the rule tilts the equities in their favor when they, and courts hearing their claims, are responsible for so much of the delay.”

What changes for voters, and what does not

For the November election, nothing changes procedurally for anyone who votes by mail. States keep using their existing ballot-envelope and verification processes rather than switching to the Postal Service's new logo, barcode, and portal-upload system. That matters at scale: close to a third of American voters, more than 48 million people, voted by mail in the 2024 general election, according to [the States United Democracy Center](https://statesunited.org/resources/americans-vote-by-mail-2024/), and a handful of states, including California, Colorado, Hawaii, Nevada, Oregon, Utah, Vermont, and Washington, run elections that are mail ballot by default rather than by request.

What the order does not do is resolve whether the Postal Service can eventually issue a version of this rule for a future election. The per curiam order and Kavanaugh's concurrence both frame the problem as timing, not authority, which leaves the door open to a similar rule reappearing with more lead time before 2028. Talwani's underlying preliminary injunction remains in effect while the states' broader challenge continues in the District of Massachusetts, meaning the legal fight over the Postal Service's power to regulate ballot mail this way is not over. It is only settled for this election.