California isn’t rolling over as the Trump administration moves to toss Obama-era vehicle emission standards.

California Attorney General Xavier Becerra said May 1 he is filing a lawsuit challenging the Environmental Protection Agency’s April 2 determination that the requirements for cars and light trucks are too stringent and must be revised.

The EPA is now in the process of rewriting those standards that aimed to slash carbon dioxide emissions from vehicles.

“The evidence is irrefutable: Today’s clean car standards are achievable, science-based and a boon for hard-working American families, but EPA and Administrator Scott Pruitt refuse to do their...