California officials say they are preparing to challenge the federal government in court after the Senate voted to overturn key waivers that supported the state’s electric vehicle (EV) emissions rules. The Republican-led vote aimed to roll back Biden-era approvals that allowed California to set stricter standards, including a plan to phase out the sale of new gas-powered vehicles by 2035.

Lawmakers supporting the move argued that Congress was using its authority to review agency decisions and restore national consistency in vehicle regulations. California leaders strongly opposed the decision. Governor Gavin Newsom called the vote unlawful and vowed to fight it in court, arguing that it undermines long-standing environmental protections.

State Attorney General Rob Bonta said California would sue to defend its authority, describing the action as an overreach that could weaken pollution standards nationwide. Some Democratic senators also warned that the vote could set a precedent affecting how Congress reviews regulatory decisions in the future, potentially expanding the scope of legislative oversight over federal agencies. Republican leaders defended the vote, stating that Democrats have previously attempted to change filibuster rules and that the current action falls within congressional powers.

They argued that vehicle mandates should not limit consumer choice or impose unrealistic timelines. Some Republican senators criticized California’s EV targets as impractical, noting current market shares and expressing concern about potential economic impacts. As both sides prepare for possible legal proceedings, the dispute highlights ongoing differences over environmental policy, regulatory authority, and the balance of power between states and the federal government.