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 21, 2026
    • Environment/Climate
    • Petition for Review

    Massachusetts v. EPA

    AG coalition files a Petition for Review challenging a proposed Environmental Protection Agency rule that would weaken regulations designed to phase out the use of hydrofluorocarbons in commercial equipment.
    Read Lawsuit
    • Jun 22, 2026
    • Environment/Climate

    California v. Environmental Protection Agency

    AG sues the U.S. Environmental Protection Agency challenging its latest attack on efforts to improve air quality and protect public health by reclassifying four Clean Air Act preemption waivers previously granted to California as “rules” subject to Congressional disapproval and sent them to Congress in apparent pursuit of such disapproval.
    Read Lawsuit
    • Jun 2, 2026
    • Environment/Climate
    • Funding Freeze
    • Executive Power

    New York v. Department of the Interior

    AG coalition sues the Department of the Interior over its unlawful settlement with TotalEnergies, under which TotalEnergies would cancel two offshore wind leases in exchange for hundreds of millions of dollars in taxpayer funds.
    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 24, 2026
    • Environment/Climate

    California v. Zeldin

    AG Coalition, along with New York City and Harris County, Texas, sue the Environmental Protection Agency over its failure to implement a life-saving 2024 Clean Air Act rule strengthening national ambient air quality standards (NAAQS) for fine particulate matter (PM2.5), commonly known as soot.
    Read Lawsuit
    • Mar 23, 2026
    • Environment/Climate
    • Executive Power

    California v. Wright

    California AG sues the U.S. Department of Energy, challenging Secretary Chris Wright’s “Pipeline Capacity Prioritization and Allocation Order” and seeking to halt its use as the basis for Sable Offshore Corp.’s (Sable) unlawful restart of two California onshore oil pipelines that are subject to State regulation and oversight, illegally superseding state law, state court orders, and a federal court-approved Consent Decree.
    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 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 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
    • Jan 9, 2026
    • Environment/Climate
    • Funding Freeze
    • Executive Power

    New York v. Burgum (1)

    New York AG sues the Trump administration for the unlawful suspension of the Empire Wind energy project.
    Read Lawsuit