California Chides GM, Toyota for Backing Trump on Fuel Rules

California’s top environmental official criticized General Motors Co. and Toyota Motor Corp. for backing the Trump administration’s attempt to revoke the state’s authority to regulate auto emissions, saying she hoped car companies had learned by now to work with the powerful agency.

The tough rules California has implemented and enforced for years already have had an impact on automakers, Mary Nichols, the chairman of the state’s Air Resources Board, said Tuesday at the BNEF Summit in San Francisco. She believes the regulator deserves some credit for the industry’s plans to field more electric vehicles in the near future.