Ongoing court cases and litigation

State attorneys general play a vital role in bringing litigation that defends the rule of law, protects the rights of residents, and upholds state and federal statutes.  

This page tracks ongoing lawsuits and legal actions led or joined by state AGs against the Trump administration — on topics ranging from civil rights and consumer protection to environmental justice and challenges to federal overreach. Here you’ll find case summaries, court filings, and the latest developments in high-impact litigation that reflect the evolving responsibilities of state attorneys general in today’s legal and political environment. 

Click here to see a full view of the litigation led by Progressive State AGs:

State Attorney General Federal Litigation Tracker

Selected Filters:

    • Oct 2, 2026
    • Environment/Climate
    • Executive Power

    California v. National Highway Traffic Safety Administration

    AG coalition sues the National Highway Traffic Safety Administration to block its rule weakening corporate average fuel economy standards for new passenger cars and light trucks.
    Read Lawsuit
    • Oct 1, 2026
    • Environment/Climate

    New York v. Environmental Protection Agency

    AGs, the governor of Pennsylvania, and three local governments sue the Environmental Protection Agency for dismantling federal greenhouse gas pollution limits for many of the nation’s largest power plants, gutting safeguards that had required coal- and gas-fired power plants to reduce their emissions and curb the pollution fueling the climate crisis.
    Read Lawsuit
    • Sep 9, 2026
    • Environment/Climate

    Massachusetts v. U.S. Fish and Wildlife Service

    AG coalition sues to block two rules that weaken protections for threatened species and their critical habitats that for decades have automatically protected newly threatened species from being killed, harmed, or harassed.
    Read Lawsuit
    • Sep 9, 2026
    • Environment/Climate

    California v. Burgum

    AG coalition challenges rules declaring that harming a protected area is only illegal if it is a direct, intentional act against an individual animal, leaving habitat destruction completely unregulated even when it kills or injures a species.
    Read Lawsuit
    • Aug 27, 2026
    • Immigration
    • Education

    United States v. Arizona

    The Department of Justice sues Arizona for state laws that provide in-state tuition and financial aid to undocumented students.
    Read Lawsuit
    • Aug 26, 2026
    • Democracy Protection/Voting Rights

    California v. United States Postal Service

    AG coalition and the governor of Pennsylvania sue the United States Postal Service to block a new rule that seeks to usurp states’ control of mail voting in elections by establishing a national voter list and directing the U.S. Postal Service to transmit mail ballots only to voters on the list.
    Read Lawsuit
    • Aug 13, 2026
    • Executive Power
    • Immigration

    Illinois v. Department of Transportation

    AG coalition and the governor of Pennsylvania sue to stop the Department of Transportation from seizing the names, dates of birth, and Social Security numbers of 17 million commercial drivers from a nationwide database.
    Read Lawsuit
    • Aug 13, 2026
    • Immigration
    • Executive Power

    Illinois v. Department of Homeland Security

    AG coalition sues to stop the Department of Homeland Security from seizing the names, dates of birth, and Social Security numbers of 17 million commercial drivers from a nationwide database.
    Read Lawsuit
    • Aug 3, 2026
    • Executive Power
    • Consumer Protection

    Oregon v. Trump

    AG coalition and the governors of Kentucky and Pennsylvania sue the Trump administration for instituting another round of unlawful and arbitrary tariffs, these justified by an alleged desire to reduce forced labor as a pretext for this new illegal tariff scheme.
    Read Lawsuit
    • Aug 3, 2026
    • Funding Freeze
    • Immigration

    New York v. Administration for Children and Families

    AG coalition and the governors of Pennsylvania and Kentucky sue the Trump administration to block a notice relating to the Temporary Assistance for Needy Families program that authorizes the wholesale sharing of recipients’ most sensitive personal information with any federal, state, or private entity, including the Department of Homeland Security.
    Read Lawsuit