California files motion to block EPA's reclassification of Clean Air Act waivers
California Attorney General Rob Bonta, Governor Gavin Newsom, and the California Air Resources Board filed a motion for preliminary injunction on June 25, 2026, seeking to block the Trump Administration's reclassification of four Clean Air Act preemption waivers as federal "rules" subject to Congressional disapproval. The EPA submitted these waivers to Congress under the Congressional Review Act, a maneuver California contends violates the Administrative Procedure Act because waivers are state regulations, not federal rules. The waivers at issue concern CARB's 2008 Greenhouse Gas standards, 2012 Advanced Clean Cars I Rule, and 2022 Small Offroad Engine Rule amendments—all foundational to California's enforcement of state-level air quality measures.