President Donald Trump signed three congressional resolutions to block California’s landmark vehicle emissions mandates. The measures overturn California’s plans to phase out the sale of new gasoline-only vehicles by 2035, roll back its low-nitrogen oxide regulations for heavy-duty trucks, and rescind an Environmental Protection Agency waiver granted in December 2023 allowing the state to enforce stricter vehicle emissions standards.
The move will likely intensify a longstanding power struggle between the federal government and the Golden State over environmental policy and differences in state and federal policy priorities. California Gov. Gavin Newsom, a Democrat, vowed to challenge the resolutions in court, arguing that the moves are illegal and will tag California taxpayers with an estimated $45 billion in additional health care costs.
Serious legal questions loom over Congress’s authority to revoke a state-level law. The Government Accountability Office, a nonpartisan congressional watchdog, previously determined that the Congressional Review Act cannot be used to block California’s vehicle emissions standards. The Senate parliamentarian, Elizabeth MacDonough, agreed with that assessment.