US Court Rejects Federal Bid to Halt Hawaii Climate Lawsuit

A U.S. federal court has dealt a setback to the Donald Trump administration, rejecting its attempt to block Hawaii from pursuing climate litigation against major fossil fuel companies.

In a ruling issued in Honolulu, Judge Helen Gillmor dismissed the lawsuit filed by the US Department of Justice, citing a long-standing legal principle that limits federal interference in state court proceedings. The court found that the federal government lacked standing, describing its claims as speculative and not based on a concrete legal injury.

The decision marks the second time in 2026 that federal courts have rejected similar efforts by the administration to preempt state-level climate lawsuits. A comparable case involving Michigan was also dismissed earlier this year.

The legal dispute stems from the administration’s attempt to prevent states from suing oil giants over their role in climate change. Hawaii proceeded with its lawsuit shortly after the federal challenge was filed.

The ruling reinforces states’ ability to independently pursue climate accountability cases, potentially paving the way for more litigation targeting fossil fuel companies across the United States.

The ruling represents an important precedent in the growing body of climate-accountability litigation targeting fossil-fuel companies. The federal court's dismissal of the DOJ's preemption challenge - the second in 2026 following a similar Michigan case - signals that state-level climate lawsuits will continue to proceed regardless of federal-administration opposition, potentially opening the door for more jurisdictions to pursue similar cases.

For fossil-fuel companies and their financiers, the accumulation of state-level climate litigation represents a growing category of transition risk that goes beyond regulatory change. Litigation-related liabilities - including potential damages, legal costs, and reputational exposure - are increasingly relevant to disclosure obligations under TCFD and ISSB S2, which explicitly require companies to disclose material climate-related litigation and regulatory risk.

For oil, gas and coal companies, their financiers and their insurers, Cognitud's climate action, sustainability due diligence and responsible investment teams help clients assess exposure to climate-litigation trends across jurisdictions, structure risk-management responses, and prepare disclosures that give investors and lenders visibility into the evolving legal-liability landscape shaping fossil-fuel-sector risk profiles.