The Supreme Court mail ballot ruling that landed this week carries an inconvenient fact for those who built their analysis around rogue lower-court judges: three justices appointed by Donald Trump himself voted against his administration, joining four others in a 7-2 denial of the government’s application for a stay in United States Postal Service, et al. v. California, et al.
The unsigned one-page order is as terse as it is dispositive. ‘The application for stay presented to Justice Jackson and by her referred to the Court is denied,’ it reads. ‘The Government is unlikely to succeed on the merits of its challenge to the District Court’s preliminary injunction. And the equitable factors applicable for obtaining emergency relief from this Court do not favor a stay.’
What the USPS Rules Actually Required
The practical stakes are worth setting out clearly. According to filings before the Supreme Court, the United States Postal Service issued a final rule in late August requiring that states and localities comply with a series of new conditions before USPS would deliver mail ballots. Those conditions included that mail ballot envelopes meet design standards with full automation compatibility, and that a voter-specific Intelligent Mail barcode (IMb) be printed on both outgoing and return envelopes.
U.S. District Judge Indira Talwani moved quickly. On 27 August 2026, she issued a 14-day temporary restraining order blocking USPS from implementing the rules for the 2026 elections, according to Ballotpedia. By 4 September, that had hardened into a preliminary injunction, again blocking implementation ahead of the elections. The administration appealed, and a federal appeals court declined to halt Talwani’s injunction, with the appellate judges writing, according to Bloomberg Law, that Talwani ‘made detailed findings about the chaos and widespread disenfranchisement that would occur’ between now and 3 November if the contested rules took effect immediately. The Supreme Court’s denial of the stay was the final step in that sequence.
The Supreme Court Mail Ballot Ruling and the Kavanaugh Concurrence
Justice Kavanaugh’s concurrence is the most analytically interesting part of the order, and it cuts both ways. He declined to rule that the USPS lacked the underlying authority to issue the rule at all. In his view, ‘based on the briefing the Court has received at this interim stage, there is at least a fair prospect that the final rule falls within the Postal Service’s statutory authority,’ citing 39 U.S.C. §401(2). That is not nothing, it leaves a door open for a future, properly timed rulemaking.
But Kavanaugh concluded that applying the rule to 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,’ referencing 39 U.S.C. §3001(m) and 5 U.S.C. §706(2)(A). The concurrence is a timing objection, not a structural one. Whether the administration reads it as an invitation to try again with more runway is a question the order itself does not close.
Justices Alito and Thomas dissented, arguing the plaintiffs lacked standing and placing the blame for the late timing of the postal rules squarely on the challengers themselves, who, they wrote, ‘bear a substantial share of the blame’ for the compressed schedule. The logic sits uneasily against the chronology: the USPS rules were issued in late August, challenges followed almost immediately, and two courts blocked them in short succession. Compressed timelines are a foreseeable consequence of late rulemaking.
The consensus read of this outcome is that it confirms judicial independence. That is probably right as far as it goes. What the consensus may be underweighting is Kavanaugh’s statutory signal. The majority did not find that USPS lacks the power to impose envelope design or barcode requirements on states. It found that doing so weeks before an election, with no implementation window, cannot survive APA review. Those are meaningfully different findings, and the administration’s strategists will not have missed the distinction.
This is the fourth major Supreme Court reversal for the administration in 2026, following the 6-3 loss on reciprocal tariffs in February, the blocking of the attempted firing of Federal Reserve governor Lisa Cook in June, and the 6-3 birthright citizenship defeat at the end of June. In each of those cases, at least one Trump-appointed justice joined the majority against the administration. The pattern is consistent, even if its future trajectory is not guaranteed.
The next question is whether the administration attempts a revised rulemaking for the cycle after 2026, this time with a longer implementation period that might satisfy Kavanaugh’s APA threshold. His concurrence, read carefully, amounts to a roadmap as much as a rebuke. The full ruling is available via the U.S. Supreme Court docket. A fuller breakdown of interim orders across 2025 and 2026 is maintained by Ballotpedia.
