Donald Trump wants federal debarment officials to investigate the National Academy of Sciences.
His target? A single chapter in a 1,600-page scientific reference manual designed to help federal judges make sense of complex evidence.
Over the weekend, the president vented on Truth Social, calling the Reference Manual on Scientific Evidence "totally discredited" and labeling its climate section "political fraud and false science". He claimed the text misled federal judges, causing massive financial harm across the nation.
It sounds like a sudden explosion. It wasn't. It's the latest escalation in a months-long campaign by conservative attorneys general and congressional Republicans to scrub climate data from the American legal system.
Here is what's really going on behind the headlines, how we got here, and why this battle over courtroom science matters far beyond Washington.
How a Judicial Handbook Became a Political Battlefield
Federal judges aren't scientists. They don't have degrees in biochemistry, fluid dynamics, or atmospheric physics. Yet every year, they're forced to rule on multi-billion-dollar lawsuits involving environmental regulation, toxic torts, and corporate liability.
To help them separate legitimate expert testimony from junk science, the Federal Judicial Center—the research arm of the federal courts—partnered with the National Academies of Sciences, Engineering, and Medicine back in the 1990s. Together, they created the Reference Manual on Scientific Evidence.
Think of it as a clear-eyed field guide for the bench. Supreme Court Justice Elena Kagan even wrote the foreword for the fourth edition, which dropped late last year.
For the first time in its history, the fourth edition added a dedicated chapter on climate science. Written by researchers Jessica Wentz and Radley Horton, the section breaks down fundamental principles like greenhouse gas mechanisms, carbon cycles, ocean warming, and attribution research—the science of determining whether specific extreme weather events can be linked to human-caused emissions.
That addition set off alarm bells in conservative legal circles.
In January, a coalition of 27 Republican state attorneys general sent a blistering demand to the Federal Judicial Center. They argued the new chapter wasn't neutral background reading. They claimed it was a partisan wedge written by researchers tied to climate litigation against energy producers, designed to tilt court cases toward environmental plaintiffs.
The pressure worked fast. By early February, the Federal Judicial Center quietly pulled the climate chapter from the digital version of the manual hosted on its website.
The National Academies Stood Its Ground
While the judicial center backed down, the National Academy of Sciences didn't.
The independent chartered body kept the chapter published on its own site. They noted that the section went through rigorous peer review by independent scientists and legal scholars before release.
That refusal to scrub the text set up the current showdown.
When Trump called for suspension and debarment reviews, he targeted the National Academies directly. Debarment is a tool normally reserved for cutting off contractors who commit fraud or cheat on government grants. Using it against a non-profit scientific institution over the content of an educational manual is virtually unprecedented.
Conservative critics maintain that the authors crossed the line into advocacy. They point to footnotes citing prominent climate figures like Michael Mann and argue that attribution science itself is too speculative for courtroom standards.
Scientists and legal experts see it differently. Over 1,300 court opinions have cited the reference manual over the decades. Taking away basic summaries of established physical science leaves individual judges isolated. Instead of consulting a peer-reviewed baseline, judges are left at the mercy of opposing expert witnesses paid hundreds of dollars an hour to tell completely conflicting stories.
What Happens Next for Courts and Science
Don't expect this argument to fade away quietly.
When you strip basic reference materials out of the judicial system, you don't eliminate climate litigation. You just make it messier, longer, and far more unpredictable.
If federal agencies move to cut funding or pull contracts from the National Academies, the dispute will likely wind up right back where it started: inside a federal courtroom. Judges will then have to decide whether executive agencies exceeded their authority while attempting to regulate scientific publishing.
If you're following this issue, watch two things over the coming months:
First, look for whether state-level court systems adopt or reject the National Academies' version of the manual independently.
Second, keep an eye on federal energy cases currently in motion. Defense teams will almost certainly file motions to disqualify plaintiff experts who rely on the peer-reviewed attribution research cited in the contested chapter.
Politics can erase a web page or delete a PDF download. It can't erase thirty years of atmospheric data, and it won't stop federal judges from having to rule on the evidence placed in front of them.
