Documents outlining the EPA's plan to roll back vehicle emission standards reference California by name 27 times.

That assessment followed a 2007 U.S. Supreme Court decision in its landmark Massachusetts v. EPA case that said the EPA has the authority under the Clean Air Act to regulate greenhouse gas emissions and required the agency to make a scientific finding on whether those emissions endanger public health.

The Environmental Protection Agency plans to relax rules aimed at reducing auto tailpipe emissions. The move is the latest Trump administration effort to undo incentives for automakers to go electric.