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.

California air-pollution regulators want to meet with Trump administration officials over plans to ease federal auto-efficiency standards, saying in a letter to the White House that efforts to undermine the state’s authority would run afoul of the law.