Federal Judge Overturns Trump Administration Endangered Species Act Rules

A federal judge in the U.S. District Court for the Northern District of California overturned four of six regulations that weakened the Endangered Species Act. The rules, issued by the first Trump administration in 2019 and maintained under the Biden administration, were found to be unlawful because they contradicted the text of the Act or were arbitrary and capricious.

The United States District Court for the Northern District of California invalidated provisions that allowed piecemeal habitat destruction through a narrowed definition of adverse modification. The ruling also struck down requirements that permitted federal agencies to ignore specific harms or rely on non-binding mitigation promises. These rules were challenged in 2024 through litigation led by the Center for Biological Diversity, Sierra Club, and WildEarth Guardians.

While the current Trump administration argues the revisions prioritize energy and agriculture industries using the best available science, plaintiffs maintain the ruling protects vulnerable species from extractive industries.