Federal judge blocks DOJ bid to stop Hawaii from suing fossil fuel companies

On April 15, 2026, Senior Judge Helen Gillmor dismissed a Trump administration lawsuit seeking to prevent 🌺Hawaii from suing fossil fuel companies in state court. The DOJ had filed the preemption suit on April 30, 2025, one day before Hawaii filed its own climate lawsuit in the Circuit Court of the First Circuit on May 1, 2025.

🌺Hawaii named BP P.L.C., BP America Inc., Chevron Corporation, Chevron U.S.A. Inc., ExxonMobil Corporation, ExxonMobil Oil Corporation, Shell P.L.C., Shell USA Inc., Sunoco LP, Aloha Petroleum Ltd., ConocoPhillips, Phillips 66, Woodside Energy Hawaii Inc., and the American Petroleum Institute as defendants. The DOJ suit came just before Hawaii's complaint, suggesting the Trump administration was attempting preemptive federal intervention to block state litigation before it advanced.

Judge Gillmor ruled that the DOJ lacked standing to bring the preemption suit. She found that the Department's claims were based on hypothetical future injuries, not concrete present harm. The federal government argued it would suffer injury to its energy policy and foreign affairs prerogatives if 🌺Hawaii's suit proceeded, but Gillmor rejected this as too speculative to support federal jurisdiction.

Gillmor wrote that the DOJ's 'attempt to predict the outcome of a yet-to-be-filed lawsuit and how it could possibly injure the federal government in the future is not a concrete injury-in-fact.' She emphasized the longstanding federal policy against federal intervention in state court processes and found no precedent for the federal government preemptively blocking a state from filing lawsuits against private parties.

The DOJ's legal theory rested on three federal statutes and constitutional doctrines. First, the department argued the Clean Air Act's comprehensive federal scheme for regulating greenhouse gas emissions creates field preemption, meaning states can't regulate emissions through tort claims. Second, it invoked the Foreign Commerce Clause, contending 🌺Hawaii's suit discriminates against interstate commerce and imposes undue burden on fossil fuel companies. Third, the DOJ claimed foreign affairs preemption under the Foreign Affairs Doctrine, arguing that holding fossil fuel companies liable for global greenhouse gas emissions interferes with the federal government's exclusive power to conduct foreign policy and trade negotiations.

Gillmor rejected all three theories as lacking standing. She noted 🌺Hawaii's lawsuit focused on deceptive marketing and failure to warn under Hawaii's Unfair or Deceptive Acts or Practices (UDAP) statute and common tort claims like negligence and nuisance, not on regulating emissions themselves. The distinction mattered: states can't set emissions standards (federal domain) but can prosecute fraud and deception (state domain).

🌺Hawaii's state court lawsuit alleges that fossil fuel companies engaged in a 'decades-long campaign of deception' about climate impacts. The complaint asserts that companies knew for over 60 years that greenhouse gas emissions from their products warm the planet, yet concealed this information and actively misrepresented the climate effects of fossil fuels in marketing and public statements.

🌺Hawaii claims this deception led to increased consumption of fossil fuel products and exacerbated climate change harms in the islands, including sea level rise, extreme weather, coral bleaching, and saltwater intrusion into freshwater aquifers. The state alleges that fossil fuel companies had a duty to warn consumers about these climate dangers or to mitigate them, but didn't.

🌺Hawaii brings seven causes of action: negligence (failure to warn about climate risks), public nuisance, private nuisance, trespass (greenhouse gas emissions), civil conspiracy to commit those torts, violations of Hawaii's UDAP statute (deceptive marketing), and violations of the state's Public Trust Doctrine (harm to public resources). The state seeks compensatory damages, punitive damages, natural resource damages, disgorgement of profits, civil penalties, and equitable relief including a fund for adaptation and resilience measures.

These claims focus on corporate conduct and deception, not emissions regulation. This distinction allowed Gillmor to distinguish between field preemption (which would block state environmental regulation of emissions) and state tort and consumer protection law (which the federal government doesn't regulate).

This dismissal follows a nearly identical ruling by JJJudge Jane M. Beckering in the U.S. District Court for the Western District of 🚗Michigan on January 24, 2026. In United States v. Michigan, Beckering dismissed the DOJ's preemptive suit against Michigan, finding the case wasn't ripe for judicial review and that the federal government lacked standing.

Beckering noted that the federal government cited no precedent in which courts preemptively enjoined a party from filing unspecified claims based solely on investigation of a litigation strategy. Despite the federal suit, 🚗Michigan proceeded to file its own lawsuit against major oil companies on January 23, 2026. Both Gillmor and Beckering relied on standing and ripeness doctrine rather than addressing preemption on the merits, meaning the question of whether the Clean Air Act actually preempts state tort claims remains open for state courts to decide.

The Supreme Court rejected fossil fuel industry petitions seeking to invalidate climate suits in state court. In April 2026, the U.S. Supreme Court declined without explanation to hear industry petitions challenging lower court decisions allowing 🌺Hawaii's climate case to proceed in state court. This cleared the way for state court litigation to move forward. The Ninth Circuit and federal district courts had previously rejected industry motions to remove Hawaii's case to federal court or dismiss it on preemption grounds.

Meanwhile, the Supreme Court agreed to review broader questions about whether state courts have jurisdiction over climate liability claims affecting interstate and international greenhouse gas emissions. This case, involving multiple states and municipalities suing fossil fuel companies, could have nationwide implications for 20+ active state and municipal climate suits. However, Gillmor's April 2026 dismissal removes a major federal obstacle regardless of what the Supreme Court eventually rules.

Attorney General AEAnne E. Lopez signaled 🌺Hawaii's intent to move the state court climate suit forward aggressively following Gillmor's ruling. Lopez had previously called the DOJ lawsuit 'a direct attack on Hawaii's rights as a sovereign state' and 'federal overreach.' The state emphasizes Hawaii's unique vulnerability to climate change due to its geography and economic dependence on the ocean and tourism.

The dismissal removes the primary federal barrier to 🌺Hawaii's state court litigation, allowing discovery, depositions, and trial preparation to accelerate. Fossil fuel companies remain defendants in state court and will likely continue raising federal preemption arguments in that forum, but they no longer have the advantage of a parallel federal suit seeking to shut down the entire state court action. This structural change gives Hawaii significant momentum heading into discovery.