Here’s what should concern anyone who still believes in impartial justice. Supreme Court Justice Elena Kagan is facing serious questions about whether she can fairly rule on a massive climate change case heading to the high court, and the accusations aren’t coming from fringe conspiracy theorists. A coalition of conservative legal groups wants the Senate Judiciary Committee to investigate whether Kagan violated federal ethics rules by refusing to step aside from Suncor Energy v. Boulder County.

The case itself matters enormously. It asks whether Colorado local governments can weaponize state law to make oil and gas companies pay for their supposed contributions to climate change. This isn’t some academic exercise. We’re talking about using the courts to extract billions from energy companies based on contested scientific theories and legal arguments that would fundamentally reshape American industry.

So what did Kagan do that’s got everyone worked up? She wrote the foreword to something called the Reference Manual on Scientific Evidence, which included a chapter on climate science. That chapter became so controversial that Congress and Republican attorneys general called it out for being blatantly one-sided. The Federal Judicial Center eventually yanked it from the manual that gets distributed to federal judges. Think about that for a second. The bias was so obvious, so egregious, that even the federal judiciary’s own educational arm had to pull it.

But Kagan’s foreword didn’t just introduce the manual. She specifically told judges they’d increasingly face lawsuits involving climate science and encouraged them to use this resource when evaluating evidence. You know what that sounds like? A justice pre-endorsing the exact legal theories that plaintiffs are now using to sue energy companies. The conservative coalition argues she’s already shown her hand, already indicated she buys into the framework these climate lawsuits depend on.

Carrie Severino from the Judicial Crisis Network didn’t mince words. She said Kagan’s conflicts “preclude her from serving as the neutral arbiter required by her oath.” That’s the heart of it right there. Federal judges are supposed to come to cases with open minds, not after they’ve written promotional material for manuals pushing theories central to one side’s argument.

The timing makes this even more troubling. These state and local climate lawsuits represent a coordinated strategy to do through litigation what activists couldn’t achieve through legislation. They want to punish energy companies, force massive payouts, and fundamentally alter American energy policy without having to convince voters or pass laws through Congress. It’s governance by lawsuit, and it depends entirely on sympathetic judges who already believe the underlying premises.

This isn’t about whether climate change is real or what policies we should adopt. Reasonable people disagree on those questions all the time. This is about whether a Supreme Court justice can fairly judge a case when she’s already publicly championed the scientific and legal framework one side is using. The answer seems pretty straightforward.

What happens if Kagan refuses to recuse herself and participates in the decision? Any ruling in favor of the plaintiffs becomes instantly suspect. It feeds every legitimate criticism about judicial activism and ideological bias on the bench. And honestly, it makes the Court look like just another political institution where justices pursue preferred outcomes rather than apply law impartially.

The Supreme Court already faces enough credibility challenges without justices inserting themselves into cases where they’ve got obvious conflicts. We expect recusal when justices have financial interests in cases. Why should intellectual and ideological commitments count for less? If anything, they’re more dangerous because they’re harder to quantify and easier to rationalize away.

Senate Judiciary Committee members need to take this seriously. Not because it’s about climate change specifically, but because it’s about the integrity of our highest court. If Kagan can participate in this case after endorsing material so biased it got removed from judicial training resources, what standard for recusal even exists anymore? The conservative legal groups calling for investigation aren’t asking for anything radical. They’re asking for basic ethical standards to actually mean something.

Related: Trump Wants Graham’s Sister to Fill Senate Seat in Heartfelt Gesture