Skip Navigation
Court Case

League of Women Voters of Massachusetts v. Trump (March 2026 Mail Voting Executive Order)  

On March 31, 2026, President Trump issued an Executive Order purporting to unilaterally impose nationwide changes to mail voting. He has no authority to do so. On behalf of voting rights groups, the Brennan Center and co-counsel sued to challenge the order. 

September 17, 2026
April 3, 2026
September 17, 2026
April 3, 2026

On March 31, 2026, President Trump issued Executive Order 14399, “Ensuring Citizenship Verification and Integrity in Federal Elections,” purportedly mandating new rules for mail ballots. This is the second time the president has issued an executive order related to elections. Three courts blocked implementation of the first executive order, affirming that the Constitution assigns authority over elections to the states and Congress, not the president. The second executive order on mail voting is unconstitutional for the same reason.

This executive order contains three primary policy directives. First, the order directs the U.S. Postal Service (USPS) to refuse to deliver mail ballots unless voters appear on a newly created list of mail voters and their ballot envelopes comport with specifications mandated by the order (Section 3 of the order). Second, it instructs the Department of Homeland Security to make a list of U.S. citizens in each state by combining data from several sources, despite none of those sources having comprehensive citizenship data and known flaws in that data. Third, it directs the attorney general to prosecute any individual, including an election official, who distributes federal ballots to ineligible voters.

On April 2, 2026, the Brennan Center and co-counsel American Civil Liberties Union (ACLU), ACLU of Massachusetts, Legal Defense Fund, Asian Americans Advancing Justice | AAJC, and LatinoJustice PRLDEF filed a federal lawsuit, League of Women Voters of Massachusetts v. Trump, to challenge the executive order. The suit was filed on behalf of the League of Women Voters of Massachusetts, League of Women Voters, Association of Americans Resident Overseas, U.S. Vote Foundation, OCA – Asian Pacific American Advocates, and Delta Sigma Theta Sorority, Inc.

The lawsuit challenges the executive order’s mandate to create new rules for mail voting. The League Plaintiffs allege that the order violates the constitutional separation of powers because the President and the USPS don’t have authority to set election rules. Only the states and Congress may do so. The League Plaintiffs also allege that the USPS has no authority to implement the order because federal statutes mandate that it deliver all mail and that those statutes assign it no authority over elections. Next, the League Plaintiffs argue that the order’s mail voting requirements would impose an undue burden on voters in violation of the Constitution’s protections of the right to vote. The League Plaintiffs further claim that the order violates the Tenth Amendment by threatening not to deliver mail-in ballots unless states alter their election procedures, violates the Voting Rights Act by preventing eligible people from voting, and fails to satisfy the requirements and protections of the Privacy Act.

Plaintiffs are litigating their case alongside another case challenging the order brought by 23 states titled State of California v. Trump.

Court Proceedings

The litigation over the executive order is ongoing. 

League of Women Voters of Massachusetts v. Trump

On April 21, 2026, a group of states led by Missouri moved to intervene as defendants, which the court permitted on May 1.

On April 23, 2026, the League Plaintiffs moved for a preliminary injunction, asking the court to block implementation of Section 3 of the executive order. On June 2, 2026, a federal district court heard oral argument on the League Plaintiffs’ preliminary injunction motion, as well as the State Plaintiffs’ motion for summary judgment in California, and defendants’ motions to dismiss.

On June 2, 2026, the USPS published a proposed rule to implement Section 3 of the executive order. 

On June 18, 2026, the district court ruled that the League and State Plaintiffs’ claims are ripe for purposes of this year’s primary and midterm elections.

In a separate litigation, NAACP v. USPS, on July 1, the D.C. district court granted a preliminary injunction—or stopped—the implementation of Section 3 of the order. Because of this, on July 13, the judge denied the League Plaintiffs’ motion for a preliminary injunction, holding that the D.C. court’s decision mooted the League Plaintiffs’ motion. However, on July 17, the D.C. Circuit reversed the lower court’s order in NAACP. Thereafter, on July 20, the League Plaintiffs filed a renewed motion for a preliminary injunction, once again seeking to stop the implementation of Section 3 of the executive order.

On August 11, the district court granted the League Plaintiffs’ renewed motion for a nation-wide preliminary injunction, thereby halting the implementation of Section 3 in all fifty states. The injunction was limited to this year’s elections.

On August 21, the USPS announced, just 74 days before the November midterms, publication of the Final Rule would take place on August 26, implementing the directive of Section 3 of the executive order contrary to the district court’s order. The League Plaintiffs filed an emergency motion to enforce the preliminary injunction issued by the district court.

Before the court could rule, the Supreme Court held in California that the States’ case was not ready for judicial review before the USPS Rule was published. Accordingly, on August 25, the district court found that defendants violated the court’s preliminary injunction but imposed no remedy. On August 26, the district court vacated the League Plaintiffs’ preliminary injunction due to the Supreme Court’s reasoning in California, but said plaintiffs could file a new complaint addressing the impact of the Final Rule.

The same day, the League Plaintiffs filed a supplemental complaint and motions for a preliminary injunction and temporary restraining order (TRO), which would immediately halt the implementation of the USPS’s Final Rule while the court decides whether to grant a new preliminary injunction (temporary restraining orders typically last for a very short period of time whereas a preliminary injunction can be in effect until a case reaches its conclusion). On August 27, the court granted the TRO, holding that the USPS may not implement or enforce the Final Rule for at least 14 days. 

The next day, federal and state defendants appealed for a stay of the TRO. On September 3, defendants moved in the Supreme Court for a stay of the TRO despite the First Circuit not yet having ruled on that issue.  

On September 4, the district court granted the preliminary injunction and dissolved the TRO, meaning the Final Rule remained blocked. The federal and state defendants appealed the decision to the First Circuit and withdrew their application to the Supreme Court to stay the TRO. However, on September 5, they appealed to the First Circuit for a stay of the injunction. On September 6, they moved in the Supreme Court for a stay without waiting for a First Circuit ruling. On September 9, the League Plaintiffs filed their opposition to defendants’ application. On September 10, the First Circuit denied defendants’ motions to stay. 

On September 14, the Supreme Court denied defendants’ application for a stay. This ruling means the that Final Rule will not take effect for the November 2026 midterm elections.

State of California v. Trump

In a parallel litigation before the same judge in the District Court of Massachusetts, 23 states and the District of Columbia have challenged Sections 2 and 3 of the Executive Order. On April 21, a group of states led by Missouri moved to intervene as defendants, which the court permitted on May 1. 

On June 25, 2026, the court granted the State Plaintiffs’ motion for summary judgment, meaning the court determined the plaintiffs won their case without needing to have a trial. The ruling barred both the USPS mail ballot changes and the DHS voter lists, and was limited to this year’s elections. The ruling was also limited to the 23 plaintiff states, meaning that the USPS and DHS could, as a legal matter, implement the order in the rest of the country. Defendants appealed this decision.

On July 7, the federal and state government defendants filed emergency motions to stay the district court’s ruling to the First Circuit. As to the mail ballot rules, the defendants argued that because the USPS had not published a Final Rule, the State Plaintiffs had not suffered an injury and therefore did not have standing to sue. On July 25, the First Circuit denied the government’s request. 

On July 27, federal defendants applied to the Supreme Court’s Emergency Docket for a stay. Four weeks later, on August 24, the Supreme Court granted the stay, agreeing with the government that the State Plaintiffs’ suit was premature before the existence of a Final Rule and lifting the injunction.

On August 21, three days before the Supreme Court ruled, however, the USPS announced, just 74 days before the November midterms, that the publication of the Final Rule would take place on August 26. On August 26, the State Plaintiffs filed a new complaint against the USPS in the District Court of Massachusetts addressing the Final Rule. They also asked for a TRO and a preliminary injunction. On August 27, the district court granted a TRO, halting the implementation or enforcement of the Final Rule for 14 days. 

The next day, federal and state defendants appealed for a stay of the TRO to the First Circuit. On September 3, defendants moved in the Supreme Court for a stay of the TRO despite the First Circuit not yet having ruled on that issue. 

On September 4, the district court granted the preliminary injunction and dissolved the TRO, meaning the Final Rule remained blocked. The federal and state defendants appealed the decision to the First Circuit and withdrew their application to the Supreme Court to stay the TRO. However, on September 5 ,they appealed to the First Circuit for a stay of the injunction. On September 6, they moved in the Supreme Court for a stay without waiting for a First Circuit ruling. On September 9, the State Plaintiffs filed their opposition to the defendants’ application. On September 10, the First Circuit denied defendants’ motions to stay.  

On September 14, the Supreme Court denied defendants’ application for a stay. This ruling means that the Final Rule will not take effect for the November 2026 midterm elections.

Case Documents

Learn more

More from the Trump Administration’s Campaign to Undermine Elections collection