This bill nullifies a regulatory change made by the Fish and Wildlife Service and National Oceanic and Atmospheric Administration in July 2026 that rescinded the definition of "harm" under the Endangered Species Act. The bill essentially reverses course on that rule, restoring the previous definition of harm that was removed by the agencies. The legislation affects how federal agencies protect endangered and threatened species by determining what actions constitute illegal harm to protected wildlife. By blocking this regulatory change, the bill preserves stricter protections for endangered species by maintaining a broader interpretation of what constitutes harmful activity. No specific funding or implementation timeline is outlined in the bill, as it is simply a legislative invalidation of an existing federal rule.