The U.S. Postal Service has issued a sweeping final rule that would require states to submit voter eligibility lists before mail-in ballots can be delivered, a move now stalled by a federal judge's injunction and headed for the Supreme Court.
USPS released the 95-page regulation on Friday, spelling out how the agency would carry out President Donald Trump's March executive order titled "Ensuring Citizenship Verification and Integrity in Federal Elections." Under the rule, any state that wants mail-in or absentee ballots delivered through the Postal Service must first enroll eligible voters on a new federal participation list, and notify USPS at least 60 days before the November 3, 2026, midterm elections if it intends to submit citizenship data.
The rule lands in the middle of a legal collision. U.S. District Judge Indira Talwani issued a preliminary injunction blocking the original version of the rule, which USPS first outlined in June. Talwani cited the potential for "confusion" and "chaos" with fewer than 90 days left before the midterms. And the Trump administration has already taken the fight to the Supreme Court, asking the justices to lift the injunction and let the restrictions take effect before voters cast ballots this fall.
USPS itself acknowledged the legal uncertainty. The agency told the New York Times it would "not take actions to implement the rule specifically before the 2026 election" unless the Supreme Court sides with the administration. That concession did not stop USPS from publishing the final rule anyway, a signal that the administration intends to have the regulatory framework locked in and ready the moment courts clear the way.
The mechanics of the rule are straightforward. States that use the Postal Service to deliver mail-in or absentee ballots must provide USPS with a list of citizens eligible to receive them. USPS would then return a finalized "Mail-In and Absentee Participation List" to each participating state's chief election official. The agency framed the system as a tracking tool: it would show how many ballots were mailed, and let law enforcement compare that number against the total received "to detect potential issues meriting further investigation."
Postmaster General David Steiner put the rationale in blunt operational terms. Fox News reported Steiner described the system as a way to match "the ballots that a state believes they're sending out to what actually gets sent out." The final rule also requires serialized barcodes on ballots, adding a layer of individual tracking that did not exist under the previous system.
The consequences for noncompliance are severe. During a Senate hearing in late June, Steiner sparred with Senate Democrats over the rule and confirmed that USPS would not deliver mail ballots to states that refuse to share their absentee voter lists. Asked directly whether a noncompliant state would still receive ballot delivery, Steiner answered: "Under our proposed regulation, no."
That answer carries enormous weight in states that have built their entire election infrastructure around universal mail-in voting. California alone has 22 million registered voters, and roughly 80 percent of them cast ballots by mail. If the rule survives judicial review, states like California face a choice: hand over voter eligibility data to the federal government, or watch their mail-ballot pipeline shut down.
Judge Talwani did not merely pause the rule on procedural grounds. She ruled that key sections of Trump's executive order were unconstitutional, issuing and later renewing her injunction in the case titled League of Women Voters of Massachusetts v. Trump. Her order blocked USPS from enforcing the mail-in voting restrictions as originally written in June.
The administration has not accepted that ruling as the final word. A federal appeals court has already kept the injunction in place, and the White House has escalated to the Supreme Court. The high court's emergency docket, which has surged back to life during summer recess with Trump-related cases, could determine whether the rule takes effect before November.
White House spokeswoman Lauren Bis framed the stakes in broad terms, as Fox News reported:
"The entire Trump administration will continue lawfully enacting the agenda President Trump was elected to enact, which includes the safety and security of American elections."
Another White House spokeswoman, Olivia Wales, drew a sharper line. She told Newsmax that the SAVE America Act, the legislative companion to Trump's executive order, "has commonsense exceptions for Americans to use mail-in ballots for illness, disability, military, or travel, but universal mail-in voting should not be allowed because it's highly susceptible to fraud."
Trump has repeatedly called for passage of the SAVE America Act throughout the summer, and the House has passed the bill in multiple forms. But the legislation has stalled in the Senate. Majority Leader John Thune, a South Dakota Republican, has consistently said the upper chamber lacks the votes to send the bill to the president's desk.
That gap between the House and Senate explains why the administration turned to executive action. Trump's March executive order, the foundation for the USPS rule, bypassed the legislative bottleneck entirely. The president has also used executive orders on related fronts, including measures targeting birth tourism and narrowing birthright citizenship, building a broader enforcement framework through presidential directives rather than waiting for Congress.
The administration's urgency has a factual backdrop that its critics have struggled to dismiss. In late July, New Jersey Governor Mikie Sherrill, a Democrat, revealed that roughly 6,600 noncitizens had registered to vote in her state between 2023 and 2024 due to a software error. The disclosure came just days after Trump alleged during a primetime address that the Communist Party of China had engaged in election interference during the 2020 presidential election.
Sherrill's admission did not prove widespread fraud. But it did prove something the administration has argued all along: that existing systems allow noncitizens onto voter rolls, and that no one catches the problem until someone decides to look. A verification mechanism like the one USPS just finalized is designed to close exactly that kind of gap.
The 60-day notification window built into the USPS rule means states would need to act by early September to participate in the new system for the November 3 midterms. With the injunction still in place and the Supreme Court yet to rule, that window is closing fast. Even if the justices side with the administration, the compressed timeline could limit how many states manage to comply.
Judge Talwani herself underscored the calendar problem in her ruling, noting that changing election rules with fewer than 90 days before a federal election risked the kind of administrative disruption that undermines voter confidence on all sides. The administration's counter-argument is equally direct: if the current system allows noncitizens to receive and return ballots without verification, the disruption is already happening, it is just invisible.
USPS published the final rule even knowing it cannot enforce it today. The Washington Examiner reported the rule is set for official Federal Register publication on August 26. That date matters: once published, the regulation exists as binding federal policy the moment courts clear its path. The administration is not waiting for permission. It is building the machinery and daring opponents to keep it switched off.
The legal battle over who may vote by mail, and under what conditions, now sits with the Supreme Court. If the justices act before September, the 2026 midterms could be the first federal election in which the Postal Service functions as a citizenship checkpoint for mail-in ballots. If they do not, the rule waits on the shelf, fully written and ready for the next cycle.
Either way, the days of mailing ballots to unverified lists without federal scrutiny appear numbered. The only question left is which election cycle pays the tab for years of looking the other way.
