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:

    • Mar 19, 2026
    • Environment/Climate

    Massachusetts v. Environmental Protection Agency

    AG coalition (including the AG from the U.S. Virgin Islands), the Governor of Pennsylvania, and 10 cities and counties filed a petition challenging the U.S. Environmental Protection Agency’s (EPA) rescission of the Endangerment Finding, EPA’s formal acknowledgement that greenhouse gas emissions from motor vehicles contribute to air pollution that drives climate change and endangers public health and welfare; it has served as the legal basis under the Clean Air Act for limiting climate pollution from vehicles.
    Read Lawsuit
    • Mar 18, 2026
    • Environment/Climate

    Colorado v. United States Department of Energy

    AG files a petition with the U.S. Court of Appeals for the D.C. Circuit to overturn an illegal emergency order issued by the U.S. Department of Energy requiring the coal-fired Craig Unit 1 in Moffat County to be available until March 30.
    Read Lawsuit
    • Mar 16, 2026
    • DEI/Civil Rights
    • Funding Freeze

    Illinois v. Department of Housing and Urban Development

    AG coalition sues the Trump administration over guidance it issued that significantly weakens fair housing protections and makes it harder to hold landlords accountable for discrimination.
    Read Lawsuit
    • Mar 12, 2026
    • Environment/Climate

    United States v. California Air Resources Board

    The US Department of Justice sues the California Air Resources Board for adopting fuel economy standards that are stricter than federal standards.
    Read Lawsuit
    • Mar 11, 2026
    • Education
    • Funding Freeze

    Massachusetts v. Department of Education

    AG coalition sues the Trump Administration for demanding that higher education institutions provide detailed data on students that would jeopardize their privacy as well as leave institutions vulnerable to inadvertent errors and unreliable data, which could lead to costly penalties and baseless investigations into their practices.
    Read Lawsuit
    • Mar 10, 2026
    • Immigration

    Maryland v. Lyons

    Maryland AG Brown sued Immigration and Customs Enforcement and the Department of Homeland Security, seeking their compliance with the AG’s administrative subpoena for records related to reported dangerous, inhumane, and unlawful conditions in ICE “hold rooms” at the George H. Fallon Federal Building in the city of Baltimore.
    Read Lawsuit
    • Mar 5, 2026
    • Executive Power
    • Consumer Protection

    Oregon v. Trump

    AG coalition plus the governors of Pennsylvania and Kentucky sue the Trump administration for imposing global tariffs that do not fall within the limited circumstances required by the relevant statute.
    Read Lawsuit
    • Mar 3, 2026
    • Environment/Climate
    • Executive Power

    Washington v. Department of Energy

    Washington AG sues the Department of Energy, alleging the federal agency violated the Freedom of Information Act (FOIA) by unlawfully withholding records related to that order to reopen TransAlta’s decommissioned coal power plant in Centralia. Additionally, the AG asked the Ninth Circuit Court of Appeals to reject an illegal attempt by the U.S. Department of Energy (DOE) to command the reopening.
    Read Lawsuit
    • Mar 2, 2026
    • Funding Freeze
    • Healthcare

    Minnesota v. Oz

    AG Ellison and the Minnesota Department of Human Services (DHS) filed a federal lawsuit against the Centers for Medicare and Medicaid Services and the U.S. Department of Health and Human Services for illegally attempting to withhold $243 million in Medicaid payments from the state of Minnesota.
    Read Lawsuit
    • Feb 26, 2026
    • Democracy Protection/Voting Rights

    United States v. Caldwell, New Jersey Secretary of State

    The Trump administration sues the state of New Jersey for refusing to hand sensitive voter information to the federal government.
    Read Lawsuit