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:

    • Jul 10, 2026
    • Education
    • Funding Freeze

    Washington v. United States Department of Education

    AG coalition sues the Department of Education to halt the effort to terminate grant programs that help schools hire mental health professionals.
    Read Lawsuit
    • Jul 7, 2026
    • Funding Freeze
    • Executive Power

    Washington v. Department of Housing and Urban Development

    AG coalition and the governors of Pennsylvania and Kentucky sue the Trump administration to block a cap on funding for permanent housing and set other unlawful conditions on Continuum of Care funds.
    Read Lawsuit
    • Jun 29, 2026
    • Healthcare

    Massachusetts v. Oz

    AG coalition and the governors of Pennsylvania and Kentucky sue the Trump Administration's over its unlawful implementation of new Medicaid work requirements included in the One Big Beautiful Bill Act, challenging provisions of an interim final rule published by the U.S. Department of Health and Human Services and Centers for Medicare & Medicaid Services.
    Read Lawsuit
    • Jun 10, 2026
    • DEI/Civil Rights
    • Funding Freeze

    Maryland v. Hegseth

    AG coalition sued the Trump administration over the addition of new terms to federal contracts that – in the name of purging “diversity, equity, and inclusion” from federal contracting – impose unclear and confusing requirements on contractors that may depart from antidiscrimination policies that contractors have followed for decades, and threaten severe penalties on federal contractors without adequate notice of what is prohibited.
    Read Lawsuit
    • May 19, 2026
    • Education

    Maryland v. Department of Education

    AG coalition sues the U.S. Department of Education over a new rule that unlawfully limits access to federal student loans by narrowing the federal definition of “professional degree” and imposes restrictions Congress did not authorize, unlawfully excluding many degree programs that qualify under the standards established by federal law.
    Read Lawsuit
    • 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 a city ordinance passed by Albuquerque that would require private businesses to delineate what areas are private and therefore off-limits to immigration agents and inform employees when immigration inspections are scheduled.
    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 31, 2026
    • Petition for Review

    Illinois v. Environmental Protection Agency

    AGs and local governments filed a petition for review challenging the Trump Administration’s repeal of the 2024 Mercury and Air Toxics Standards (MATS) Rule that implemented nationwide standards that limit emissions of toxic air pollutants from coal- and oil-fired power plants, including mercury, arsenic, lead and other toxic metals, in addition to acid gases, such as hydrogen chloride and formaldehyde.
    Read Lawsuit
    • Mar 23, 2026
    • DEI/Civil Rights
    • Funding Freeze
    • LGBTQ Rights
    • Immigration

    Massachusetts v. Department of Agriculture

    AG coalition sues challenging the Trump Administration’s attempt to impose new discriminatory conditions on U.S. Department of Agriculture (USDA) grants that would require federal funding recipients to comply with vague, hateful, and unrelated policies on immigration, gender ideology, transgender athletes, and diversity, equity, and inclusion.
    Read Lawsuit
    • Mar 19, 2026
    • Petition for Review

    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 for review 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