Trump Administration Sues California Over Vehicle Emission Rules

Federal government challenges state's authority to set stricter standards than national rules.

Mar. 13, 2026 at 2:36am

Got story updates? Submit your updates here. ›

The Trump administration has filed a lawsuit against California over the state's vehicle emission standards, which are the nation's strictest. The lawsuit argues that California does not have the authority to enforce its own emissions rules, which are aimed at curbing pollution and promoting electric vehicle adoption. The move comes as gas prices climb nationwide, with California having the highest prices in the country.

Why it matters

This legal battle is the latest chapter in an ongoing clash between the federal government and California over environmental regulations. California has long held a waiver from the EPA that allows it to set vehicle emission standards that are more stringent than federal rules, but the Trump administration previously revoked that authority. The outcome of this lawsuit could have major implications for the future of vehicle emissions regulations and California's ability to pursue its own climate and clean air policies.

The details

The Trump administration's lawsuit argues that California's vehicle emission standards, including its mandate for electric vehicle sales, violate federal law. The federal government claims that only the national government has the authority to set such rules. California quickly sued the Trump administration last year after it blocked the state's plan to ban the sale of new gas-powered cars by 2035. The state has said its previously adopted emissions standards will remain in effect even if the more ambitious rules are blocked.

  • The Trump administration filed the lawsuit on March 13, 2026.
  • Last summer, the Trump administration blocked California's plan to ban the sale of new gas-powered cars by 2035.

The players

Donald Trump

The former president who has long fought against California's efforts to curb vehicle emissions and promote electric vehicles.

Gavin Newsom

The Democratic governor of California, whose office blasted the Trump administration's lawsuit.

Pam Bondi

The U.S. Attorney General who said the lawsuit is aimed at stopping "oppressive, expensive electric vehicle mandates" that "violate federal law."

California Air Resources Board

The state agency that has said previously adopted emissions standards will remain in effect even if the state's more ambitious rules are blocked.

U.S. Environmental Protection Agency

The federal agency that has granted California a waiver to set stricter vehicle emission standards, a authority that was revoked by the Trump administration but later reinstated under President Biden.

Got photos? Submit your photos here. ›

What they’re saying

“Gas prices are soaring nationwide because of Trump's reckless choices, and now he's attacking the Golden State for trying to give Californians more freedom and cheaper options.”

— Anthony Martinez, Spokesperson for Gov. Gavin Newsom

“Oppressive, expensive electric vehicle mandates drive up costs for American consumers and violate federal law.”

— Pam Bondi, U.S. Attorney General

“It's ironic that they're doing this just at the time when people are most worried about gas prices.”

— Dan Farber, Faculty Director, Center for Law, Energy, and the Environment, UC Berkeley Law School

What’s next

The lawsuit will likely be heard in federal court, where a judge will determine whether California has the authority to enforce its own vehicle emission standards or if the federal government has sole jurisdiction over such rules.

The takeaway

This legal battle is the latest clash between California and the federal government over environmental regulations, with major implications for the future of vehicle emissions policies and the state's ability to pursue its own climate and clean air agenda. The outcome could significantly impact the pace of electric vehicle adoption and emissions reductions in the nation's most populous state.