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 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
    • Mar 30, 2026
    • LGBTQ Rights

    United States v. Minnesota Department of Education

    The Department of Justice sues the state of Minnesota for its policy allowing trans female students to play sports with other female students. alleging violations of Title IX.
    Read Lawsuit
    • Mar 24, 2026
    • Military Occupation of US Cities
    • Immigration
    • Executive Power

    Minnesota v. Department of Justice

    AG sues the Departments of Justice and Homeland Security for access to evidence collected by the federal government in relation to the homicide of two Minnesotans by federal immigration agents during the "Operation Metro Surge" deployment of militarized immigration enforcement.
    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
    • 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