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:

    • 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
    • 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 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 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
    • Feb 18, 2026
    • Funding Freeze

    California v. Wright

    AGs sue the Trump administration for terminating congressionally mandated funding for key energy and infrastructure programs.
    Read Lawsuit
    • Jan 13, 2026
    • LGBTQ Rights
    • Funding Freeze
    • DEI/Civil Rights

    New York v. Department of Health and Human Services

    AGs sue the Trump administration for unlawfully conditioning hundreds of billions of dollars in federal funding on states’ agreement to discriminate against transgender people.
    Read Lawsuit
    • Dec 23, 2025
    • LGBTQ Rights

    Oregon v. Kennedy

    AGs filed a complaint challenging the HHS declaration that claims gender-affirming care fails to meet professionally recognized standards of care and therefore HHS can disqualify doctors or hospitals providing such care from Medicare and Medicaid.
    Read Lawsuit