The Environmental Protection Agency’s plan this week to relax rules aimed at cleaning up auto tailpipe emissions is the latest Trump administration move to undo incentives for automakers to go electric.

If approved, the EPA’s proposal would rescind the 2009 decision that set forth a legal basis to regulate greenhouse gases as pollutants. Known as the "endangerment finding," it allowed the EPA to limit emissions from vehicles, power plants, and oil and gas companies under the Clean Air Act.

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.