On Monday, California initiated legal proceedings against the Trump administration following the Environmental Protection Agency’s decision to bring the state’s vehicle emissions waivers under the scrutiny of Congress. This move marks the beginning of a legal confrontation that may ultimately decide California’s enduring authority over the U.S. automotive industry.
The legal challenge, spearheaded by California Attorney General Rob Bonta, takes aim at the EPA’s effort to forward four emissions waivers from the state to Congress, invoking the Congressional Review Act—an instrument permitting legislative bodies to nullify specific federal regulations.
When approached for comments on the lawsuit, the EPA refrained from offering any statements.
In an earlier announcement this month, the agency justified its actions by emphasizing its dedication to enhancing consumer options and maintaining vehicle affordability nationwide, while adhering to what it interprets as the correct legal framework.
California Attorney General Rob Bonta addresses the media at a news conference held in Sacramento. (Reuters/Fred Greaves/File Photo)
California argues the move threatens its authority under the Clean Air Act to impose vehicle emissions standards stricter than federal requirements. The state also contends that other states have adopted California’s emissions standards over the years, extending its influence beyond its borders.
At issue is the EPA’s decision earlier this month to submit four California waivers covering vehicle emissions and lawn and garden equipment to Congress for review under the Congressional Review Act.
California argues the EPA is improperly attempting to transform agency decisions that have historically been treated as waivers into regulations that Congress can overturn.
EPA Administrator Lee Zeldin attends a meeting with President Donald Trump and NATO Secretary General Mark Rutte in the Oval Office of the White House in Washington, D.C., on March 13, 2025. (Andrew Harnik/Getty Images)
“No agency has the power to wave a magic wand and transform an action that was finalized as an adjudicatory order into a rule, and certainly not without a public process in which the agency acknowledges and explains its change in position,” the state wrote in its lawsuit.
The legal fight marks the latest clash between California and the Trump administration over environmental policy and vehicle emissions regulations.
Last year, Trump and congressional Republicans used the Congressional Review Act to overturn California’s electric vehicle sales mandates and diesel engine rules. California later challenged those actions in court.
Vehicles drive on the 101 freeway in midday traffic in Los Angeles, California, on April 4, 2022. (Mario Tama/Getty Images)
The outcome of the latest lawsuit could have implications beyond California, potentially determining whether Congress can more easily unwind environmental policies through the Congressional Review Act and whether California can continue using federal waivers to shape emissions standards adopted by other states.
The Alliance for Automotive Innovation did not immediately respond to News Media’s request for comment.