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 11, 2026
    • Education
    • Funding Freeze

    Massachusetts v. Department of Education

    AG coalition sues the Trump Administration for demanding that higher education institutions provide new data via a recently added component to the Integrated Postsecondary Education System that would leave institutions vulnerable to inadvertent errors and unreliable data and could lead to costly penalties and baseless investigations into their practices, and that it jeopardizes student privacy by requesting in-depth information about individual students.
    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
    • Feb 25, 2026
    • Funding Freeze
    • Executive Power

    Colorado v. United States

    AG coalition sues the U.S. Department of Homeland Security and the Federal Emergency Management Agency for illegally and abruptly ending millions in grants to states to prevent targeted violence and terrorist attacks
    Read Lawsuit
    • Feb 24, 2026
    • Healthcare
    • Executive Power

    Arizona v. Kennedy

    AGs sue the Trump administration over changes that stripped seven childhood vaccines — those protecting against rotavirus, meningococcal disease, hepatitis A, hepatitis B, influenza, COVID-19, and respiratory syncytial virus (RSV) — of their universally recommended status. The lawsuit also challenges Secretary Kennedy's unlawful replacement of the Advisory Committee on Immunization Practices (ACIP).
    Read Lawsuit
    • Feb 23, 2026
    • Immigration
    • Executive Power

    United States v. New Jersey

    The Trump administration sues the state of New Jersey for allegedly obstructing federal immigration enforcement by barring their activities from state-owned property.
    Read Lawsuit
    • Feb 23, 2026
    • Immigration
    • Executive Power
    • Military Occupation of US Cities

    Maryland v. Noem

    AG Brown sues the Trump administration to stop the Department of Homeland Security and ICE from converting a warehouse into a massive immigrant detention facility without proper oversight, reviews, or permits.
    Read Lawsuit