Attorney General Bonta Secures Preliminary Injunction in Lawsuit Challenging Trump Administration’s Attack on Clean Air Act Waivers

September 2, 2026 Contact: (916) 210-6000, agpressoffice@doj.ca.gov OAKLAND — California Attorney General Rob Bonta today secured a preliminary injunction in the ongoing challenge against the U.S. Environmental Protection Agency’s (EPA) attack on California's emission standards. In June 2026, President Trump and EPA Administrator Lee Zeldin purported to reclassify four Clean Air Act preemption waivers — previously granted to California to improve air quality and protect public health — in an unlawful attempt to circumvent administrative procedure and attack state emissions rules. Shortly thereafter, Attorney General Bonta, California Governor Gavin Newsom, and the California Air Resources Board (CARB) filed a lawsuit in the U.S. District Court for the District of Columbia challenging the reclassifications, but the EPA then moved to reclassify two additional preemption waivers before the court even had an opportunity to rule. Today, the district court rejected EPA’s “gamesmanship,” concluding it “may seem like a clever policy move, but undermines honest compliance with the law, which is what Americans should expect from executive branch agencies.” The court’s order requires EPA to w