Attorney General Phil Weiser sues U.S. Postal Service over unlawful attempt to interfere with states’ mail ballot elections

Aug. 26, 2026 (DENVER) – Attorney General Phil Weiser today joined a coalition of 25 states in filing a lawsuit against the U.S. Postal Service challenging its new rule that purports to grant itself the authority to regulate mail voting in elections.

Tens of millions of voters across the country rely on mail-in ballots, including Colorado, and the coalition argues the USPS rule will prevent states from effectively administering their mail voting programs, putting citizens’ right to vote at risk.

“This USPS rule is the latest attempt by the Trump administration to exert federal control over elections, cause mischief ahead of the midterm elections, and seize states’ constitutional authority to administer elections. States determine the time, place and manner of elections – not the president. And Congress has never given the USPS authority to regulate mail ballots. Most Coloradans vote using mail ballots, and I will continue to defend our state’s gold standard election system,” Attorney General Weiser said.

On March 31, President Trump issued an executive order attempting to establish a national list of eligible voters and directing the USPS to transmit mail ballots only to voters on the list. On August 21, USPS announced a new rule implementing the president’s demands that require states to register every voter who is eligible to vote by mail with USPS and tasking USPS with compiling the registered voters into state-specific lists.

The rule also establishes new design requirements for the mail-in ballot envelopes created by states, which states are required to meet and get approved by USPS. Under the rule, USPS will not deliver ballots to voters who do not appear on the USPS-generated lists and will not deliver ballots in envelopes that fail to comply with the rule’s new standards.

Attorney General Weiser and the coalition argue the rule inflicts significant, irreparable harm on states by imposing burdensome mail voting requirements that risk disenfranchising eligible voters. With the start of the general election season mere weeks away, states must bear the cost of redesigning their mail ballot envelopes and securing USPS review and approval before they can even register mail voters with USPS. Within a matter of weeks and without any additional resources, state election officials must also develop new systems to communicate mail voter lists to USPS to ensure that every eligible voter who is entitled to a mail ballot receives one. States must also create new guidance for election officials, train them on the new procedures, and educate the public about the changes prior to the upcoming election.

Even if states were to meet these enormous administrative and financial burdens, the rule could still result in eligible voters not receiving their ballots due to, for instance, administrative errors or flaws in the rushed and untested new procedures.

Over the past several decades, voting by mail has become more popular across the country. Since the inception of vote-by-mail, Congress has never exercised its authority to limit it, and in fact, has only taken action to expand and protect mail voting for military and overseas voters. Congress has also never authorized USPS to monitor or control the transmission of mail ballots.

The coalition argues that USPS’s rule violates the Constitution, which makes clear that states have the primary authority to administer elections, and upends successful, longstanding vote-by-mail procedures. The lawsuit argues that the rule is inconsistent with USPS’s governing statutes, ignores USPS’s procedural requirements, violates the Privacy Act, and is inconsistent with federal voting rights law. The coalition of states asks the court to strike down the unlawful rule and issue a temporary restraining order preventing the rule from taking effect while the litigation proceeds.

In April, Attorney General Weiser joined a coalition of 24 states in suing the administration to block its unlawful executive order that prompted the creation of USPS’s rule.

Joining Colorado in filing this lawsuit, which was co-led by the attorneys general of California, Massachusetts, Nevada, and Washington, are the attorneys general of Arizona, Connecticut, Delaware, the District of Columbia, Hawaiʻi, Illinois, Maine, Maryland, Michigan, Minnesota, New Jersey, New Mexico, New York, North Carolina, Oregon, Rhode Island, Vermont, Virginia, Wisconsin, and the Governor of the Commonwealth of Pennsylvania.

Read the complaint California v. United States Postal Service (PDF).

 

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Media Contact:
Lawrence Pacheco
Chief Communications Officer
(720) 508-6553 office
lawrence.pacheco@coag.gov