USPS Whistleblower Warns Mail Ballot System Could Block Thousands of Votes: What to Know

A new U.S. Postal Service system for handling federal mail ballots could cause entire batches of ballots to be rejected because of a single barcode error, a whistleblower warned Tuesday, raising fresh concerns about whether voters will receive their ballots in time for the November midterm elections.

The disclosure, made public by Sen. Richard Blumenthal, D-Conn., comes as the Postal Service faces a rapidly moving legal fight over President Donald Trump’s March executive order seeking tighter restrictions on mail voting.

The whistleblower alleges that USPS built the new Federal Ballot Mail Portal in roughly three months, despite such a complex system normally taking much longer to develop and test.

The warning is particularly significant because some states are preparing to begin sending ballots to voters within days.

North Carolina is scheduled to begin mailing certain absentee ballots Friday, while other states will begin sending ballots later in September.

One Error Could Affect Thousands of Ballots

At the center of the whistleblower’s concerns is a proposed verification process for bulk ballot mailings.

Under the system described in the disclosure, election officials would provide USPS with information about ballot envelopes, including unique barcodes.

Postal workers would then sample envelopes from a batch to verify that the information corresponds with the state’s submitted list.

The whistleblower alleges that the system has a zero-percent failure tolerance.

In a case of even one sampled barcode that fails to scan or match the state’s information, USPS could reject the entire batch and return it to election officials.

A batch could contain tens of thousands of ballots, meaning a single technical or administrative mismatch could potentially delay thousands of legitimate ballots at once.

Blumenthal described the disclosure as evidence of a system that could create widespread voting problems. “The Postal Service has designed a system to disenfranchise millions of Americans,” he said, according to the Associated Press.

The whistleblower, represented by Whistleblower Aid, characterized the development process as rushed and inadequately tested.

The disclosure warns that the system’s design could produce repeated verification failures and prevent ballots from reaching voters on time.

The USPS System Being Built

The proposed portal stems from Trump’s March executive order directing changes to federal mail voting.

The administration has argued that the measures are intended to strengthen election integrity.

The USPS final rule requires states using the mail for federal ballots to meet new envelope and data requirements, including unique Intelligent Mail barcodes and information about ballots being sent.

USPS says it is regulating how federal ballot mail enters the postal system rather than determining voter eligibility itself.

USPS says election officials remain responsible for determining which voters receive ballots.

The Postal Service has said its role is to process mail that meets the applicable requirements and that it does not inspect the contents of sealed ballots or determine voter eligibility.

The agency’s existing election-mail program also says it has established processes for handling and delivering Election Mail, including ballots.

The Legal Status Still Changing

The whistleblower disclosure arrives amid an unusual sequence of court orders that has left the status of the new rules in flux.

U.S. District Judge Indira Talwani previously blocked implementation of key portions of Trump’s mail-voting directive.

On Aug. 24, however, the Supreme Court stayed that injunction while litigation continues in the lower courts.

The high court emphasized that its procedural ruling did not necessarily determine whether future government actions implementing the order would be lawful.

The dispute intensified again last week after USPS issued its final rule.

Talwani subsequently issued a temporary restraining order blocking enforcement of the new requirements, and on Aug. 31 declined to pause that order.

She did allow USPS to continue developing the portal as long as states are not required to participate while the legal fight continues.

The Trump administration has now asked the U.S. Court of Appeals for the First Circuit to lift the latest restriction, adding another layer of uncertainty as states approach their ballot-mailing deadlines.

Voters Should Know

The whistleblower’s warning does not equate to thousands of ballots that are rejected.

It concerns the aftermath if the proposed system is implemented and encounters the alleged verification problems.

States have different rules and deadlines for requesting, sending and returning absentee ballots, while the federal litigation could determine whether USPS’s new requirements apply during the 2026 election.

The Postal Service also published its 2026 election-mail guidance separately from the disputed new system and continues to describe its existing ballot-mail operation as a tested process for transporting election materials.