In a federal lawsuit filed June 12, 2025, California and ten other states are challenging the legality of three Congressional resolutions signed by President Trump that disapprove key EPA waivers. The waivers, granted between 2023 and early 2025, allow California to implement its Advanced Clean Cars II, Advanced Clean Trucks, and Omnibus Low NOx regulations—rules that several states have since adopted.
At the heart of the complaint is the assertion that EPA waiver decisions are not “rules” under the CRA and thus cannot be overturned by Congressional vote. The plaintiffs argue that the federal government violated long-standing legal interpretations and overstepped its authority by nullifying state-level climate action.
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