The Trump administration's attempt to impose sweeping new restrictions on mail ballots before the 2026 midterm elections has run into an obstacle it could not overcome: the United States Supreme Court.
On September 14, the Court rejected an emergency request from the administration seeking permission to enforce new U.S. Postal Service requirements governing mail ballots.
The ruling leaves a lower-court injunction in place and prevents the new system from being implemented for the November midterms.
In its brief order, the Supreme Court said the government was “unlikely to succeed on the merits” of its challenge to the injunction.
The decision is particularly notable because it came from a Supreme Court with a 6-3 conservative majority.
What the Administration Wanted to Change
The dispute grew out of a March executive order from President Donald Trump directing the Postal Service to develop new requirements for election mail.
The Postal Service subsequently adopted a rule that would have significantly changed how states prepare and send mail ballots.
Under the new system, ballot envelopes would have been required to meet specific Postal Service design standards, including specialized barcodes unique to individual voters.
State election officials would also have been required to upload voter information into a Postal Service system.
The Postal Service would then verify ballot mail for compliance.
Mail that failed to satisfy the requirements could be rejected and returned to election officials for correction.
The administration argued that the changes were an important safeguard against voter fraud.
States and voting-rights organizations challenged the rules, arguing that the Postal Service had exceeded its authority and that attempting to build an entirely new ballot-mail system immediately before a national election could interfere with legitimate voting.
The Clock Was Running Out
Timing became one of the central problems for the administration.
The Postal Service finalized its rule in late August.
The midterm election is November 3.
That left state and local election officials with only weeks to redesign ballot envelopes, obtain Postal Service approval, modify election systems and comply with the new voter-data requirements.
U.S. District Judge Indira Talwani blocked the rule on September 4.
The administration then asked the Supreme Court to intervene on an emergency basis and allow the Postal Service requirements to take effect while litigation continued.
The Supreme Court declined.
Kavanaugh: Too Late for the 2026 Election
Justice Brett Kavanaugh wrote separately to explain his reasoning.
Kavanaugh said there was at least a “fair prospect” that the Postal Service possesses the legal authority to establish such requirements.
But that did not mean the government could impose them immediately.
He concluded that applying the new rule to the 2026 elections would violate federal administrative law because state and local election officials simply did not have enough time to implement the system reasonably before voting.
That distinction is important.
The Supreme Court did not issue a final ruling declaring that the Postal Service can never establish additional requirements for ballot mail.
Instead, it refused to allow these particular rules to take effect in the middle of preparations for the 2026 election.
The administration could therefore continue defending the Postal Service's underlying authority in subsequent litigation or potentially pursue different regulations for future elections.
Alito and Thomas Dissented
Justices Samuel Alito and Clarence Thomas disagreed with the Court's decision.
Alito argued that the Postal Service has broad authority to regulate the mail and said he believed the government was likely to succeed in its appeal.
Thomas joined his dissent.
No other justice publicly dissented from the Court's decision.
That meant several members of the Court's conservative majority were unwilling to give the administration the emergency relief it requested.
Trump Has Long Targeted Mail Voting
The legal battle is part of Trump's continuing campaign against mail voting.
Trump has repeatedly questioned the security of voting by mail and has made unsupported claims about widespread election fraud.
Documented cases of voter fraud do occur, but evidence has not established the widespread mail-voting fraud Trump has alleged.
Trump himself has also voted by mail.
His administration nevertheless sought to expand federal involvement in the mechanics of how states distribute mail ballots.
That raised a fundamental constitutional issue because American elections have traditionally been administered primarily by state and local governments under rules established within the constitutional framework governing elections.
The states challenging the Postal Service rule argued that the federal executive branch was attempting to intrude on that authority.
Millions of Voters Could Have Been Affected
This was not an obscure dispute over Postal Service procedures.
Mail voting is now used by millions of Americans.
About one-third of voters cast mail ballots in the 2024 presidential election.
Changing the requirements for processing that mail only weeks before another nationwide election therefore carried potentially significant consequences.
The First Circuit Court of Appeals, which declined to suspend the lower court's injunction, warned that implementing the Postal Service rule could potentially disenfranchise large numbers of voters while producing little or no benefit in preventing fraud.
The administration disputed that assessment and maintained that the requirements were legitimate safeguards.
For the 2026 midterms, however, that debate has effectively been settled.
The new restrictions will not be implemented.
Another Limit on Presidential Power
The ruling illustrates an important feature of the American constitutional system.
A president can issue executive orders.
Federal agencies can adopt regulations.
But those actions remain subject to federal law, constitutional limits and judicial review.
The Trump administration asked the nation's highest court to intervene immediately and allow its new mail-ballot system to proceed.
The Supreme Court declined.
Its explanation was remarkably concise.
The government was unlikely to prevail on its challenge to the injunction, the Court said, and the circumstances did not justify emergency intervention.
For voters preparing to cast ballots in November, the practical consequence is much simpler:
The Trump administration's new Postal Service restrictions will not govern mail voting in the 2026 midterm elections.