Conservative Groups Demand Ethics Probe Into Justice Kagan Over Climate Case Impartiality

A coalition of conservative legal organizations sent a letter to the Senate Judiciary Committee on Monday calling for an ethics investigation into Supreme Court Justice Elena Kagan, arguing that she cannot be impartial in the upcoming landmark climate case Suncor Energy v. Boulder County. The controversy reignites debates about judicial ethics and recusal standards at the nation’s highest court.

The Allegation

The coalition — led by the Judicial Crisis Network (Concord Fund), The Heritage Foundation, and the National Republican Lawyers Foundation — alleges that Justice Kagan compromised her impartiality by writing the foreword to the Reference Manual on Scientific Evidence (Fourth Edition), published in December 2025. The manual included a chapter on Climate Science that critics say embraced disputed legal theories used by plaintiffs in climate litigation against fossil fuel companies.

According to Fox News, the coalition argues that Kagan’s endorsement of the manual creates the appearance that she has already embraced the legal theories underlying the plaintiffs’ claims in the Suncor case. The climate science chapter was so controversial that the Federal Judicial Center (FJC) removed it from the manual on February 6, 2026, after complaints from Republican attorneys general and members of Congress.

The Case at the Center of the Dispute

Suncor Energy v. Board of County Commissioners of Boulder County (No. 25-170) represents the Supreme Court’s first direct confrontation with whether the Clean Air Act or the Constitution’s structure bars state-law climate damage claims against fossil fuel producers. The case originated in Colorado, where Boulder County and the City of Boulder sued Suncor Energy and Exxon Mobil Corporation in state court, claiming the companies misled the public about their contributions to climate change and seeking damages under state nuisance law.

The central legal question is whether federal law preempts state common law claims based on greenhouse gas emissions. The energy industry argues that the Clean Air Act, which regulates emissions, displaces state tort claims. Environmental advocates and local governments counter that state nuisance law is a traditional area of state authority not displaced by federal regulation. The Supreme Court granted certiorari on February 23, 2026, and oral arguments are expected in the fall.

As The Center Square reported via Yahoo News, the coalition’s letter states: “Justice Kagan’s participation in the Suncor case is indefensible given her public endorsement of climate-lawfare plaintiff theories.”

Kagan’s Role in the Manual Controversy

Justice Kagan wrote the foreword to the Reference Manual on Scientific Evidence, in which she noted that judges would increasingly confront lawsuits involving “climate science” and encouraged them to use the manual as a resource for evaluating scientific evidence. Conservative groups argue this constitutes an endorsement of the legal theories underlying the plaintiffs’ claims.

Carrie Severino, president of the Judicial Crisis Network, said in a statement: “Justice Kagan’s conflicts of interest on climate litigation preclude her from serving as the ‘neutral arbiter’ required by her oath. By endorsing and penning a promotional preface for a judges’ reference manual featuring an overtly biased ‘climate science’ chapter, she embraced the partisan ideals and legal theories driving state and local climate lawfare.”

The coalition’s letter also points to what it characterizes as a pattern of inconsistent recusals by Kagan, citing her participation in NFIB v. Sebelius (the 2012 Affordable Care Act case) despite serving as Solicitor General during the law’s defense, and American Tradition Partnership v. Bullock, which revisited Citizens United issues after Kagan argued against that decision as Solicitor General.

Broader Supreme Court Ethics Context

The call for a Kagan investigation comes against the backdrop of intense scrutiny of Supreme Court ethics that has intensified in recent years. In 2023 and 2024, the Senate Judiciary Committee — then under Democratic control — investigated ethics concerns involving Justices Clarence Thomas and Samuel Alito following reports about undisclosed luxury travel, gifts, and relationships with wealthy benefactors. The committee held hearings and authorized subpoenas, though the inquiry did not lead to impeachment proceedings.

As legal scholar Jonathan H. Adler of William & Mary Law School noted in his preview of the case, the Suncor case is expected to be one of the most consequential of the Court’s upcoming term, with implications for dozens of similar climate lawsuits filed by state and local governments against fossil fuel companies across the country.

What Happens Next

Justice Kagan is scheduled to appear alongside Justice Amy Coney Barrett before the House Appropriations Committee on July 14 to testify on the Supreme Court’s FY2027 budget — one of the rare occasions sitting justices publicly testify before Congress. It remains to be seen whether the Senate Judiciary Committee will take action on the coalition’s letter.

If Kagan recuses herself from the Suncor case, the Court would have only eight justices to decide it, potentially leading to a 4-4 tie, which would affirm the lower court’s ruling allowing the state law claims to proceed. If an investigation proceeds, it could further erode public confidence in the Supreme Court’s nonpartisan character, regardless of outcome.

The controversy underscores the increasingly politicized environment surrounding the Supreme Court, where ethics complaints have become a recurring feature of the confirmation and oversight process regardless of which party controls the Senate.