In summary

News reports say federal officials are to negotiate auto emission and fuel-efficiency standards with California. But the state’s air regulators haven’t heard from Washington yet.

The standoff between California and the Trump administration over automobile emissions standards continued this week, despite reports that the president ordered two federal agencies to begin negotiating with the state.

Trump met with automakers last week, and industry officials reportedly told the president they hoped he could sort out differences with California, which sets its own emissions standards.

In practice, the state’s stringent requirements have been adopted as a benchmark in the national fuel-efficiency standard. The auto industry earlier agreed to make cars gradually more fuel efficient, adding that no one wins if there are two sets of emissions standards.

That agreement, established during the Obama administration, is under review by the Environmental Protection Agency and the Department of Transportation, which have signaled an intention to roll back the standards.

According to a report by the Associated Press, Trump left a meeting with auto executives Friday and directed the two agencies to enter talks with California to resolve the issue.

No one from the administration has yet contacted the California Air Resources Board, which regulates automobile emissions, according to spokesman Stanley Young.

California and more than a dozen other states are suing the federal government to prevent any reduction in the standards.

Note: This post was updated to clarify which rules California sets.

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Julie Cart joined CalMatters as a projects and environment reporter in 2016 after a long career at the Los Angeles Times, where she held many positions: sportswriter, national correspondent and environment...