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:

    • May 8, 2026
    • Immigration

    United States v. New Mexico

    The Department of Justice sues the state of New Mexico, challenging a state law that bars federal government use of local government property to carry out immigration enforcement and requiring private businesses to tip off illegal aliens about immigration enforcement activities.
    Read Lawsuit
    • May 6, 2026
    • Gun Safety

    United States v. Colorado

    The United States Department of Justice sues the state of Colorado, challenging their large-capacity magazine limit law.
    Read Lawsuit
    • May 4, 2026
    • Environment/Climate

    United States v. Minnesota

    The Department of Justice sues Minnesota over its attempt to regulate global greenhouse gas emissions.
    Read Lawsuit
    • Apr 29, 2026
    • Military Occupation of US Cities

    United States v. New Jersey

    The Trump administration sues New Jersey for its "mask ban" prohibiting law enforcement from hiding their faces and identities while engaged in official duties.
    Read Lawsuit
    • Apr 28, 2026
    • Executive Power
    • Consumer Protection

    United States v. Wisconsin

    The Commodity Futures Trading Commission sues Wisconsin for its attempt to regulate prediction markets.
    Read Lawsuit
    • Apr 24, 2026
    • Executive Power
    • Consumer Protection
    • Privacy/Technology

    United States v. New York

    The Commodity Futures Trading Commission sues the state of New York to preempt their attempted regulation of prediction markets.
    Read Lawsuit
    • Apr 24, 2026
    • Environment/Climate

    California v. Zeldin

    AG Coalition, along with New York City and Harris County, Texas, sue the Environmental Protection Agency over its failure to implement a life-saving 2024 Clean Air Act rule strengthening national ambient air quality standards (NAAQS) for fine particulate matter (PM2.5), commonly known as soot.
    Read Lawsuit
    • Apr 24, 2026
    • Immigration

    Arizona v. Mullin

    Arizona AG sues the Department of Homeland Security and Immigration and Customs Enforcement to stop them from converting a vacant warehouse into an immigrant detention facility in the city of Surprise, AZ.
    Read Lawsuit
    • Apr 13, 2026
    • Immigration

    United States v. Connecticut

    The United States government sues Connecticut, Governor Lamont, Attorney General Tong, the City of New Haven, and Mayor Elicker to challenge the State’s and City’s sanctuary policies.
    Read Lawsuit
    • Apr 3, 2026
    • Democracy Protection/Voting Rights
    • Executive Power

    California v. Trump

    AG coalition and Pennsylvania governor Shapiro sue to block President Trump’s mail-in voting executive order.
    Read Lawsuit