A March 30, 2026, decision from the U.S. District Court for the Northern District of California, in Center for Biological Diversity v. U.S. Department of the Interior, vacated key provisions of the Endangered Species Act (ESA) regulations, including several regulations from 2019 that were revised and/or reissued in 2024. This ruling arrives amid a swirl of potential changes to implementation of the ESA, and signals that courts will be closely scrutinizing forthcoming regulations for consistency with a statute that has long been labeled the “pit bull” of environmental statutes.