A coalition of conservative groups urged Environmental Protection Agency Administrator Scott Pruitt on Wednesday to revoke California’s ability to set its own strict fuel-efficiency standards for vehicles.

“The EPA has a responsibility to American citizens, but not one to promote solutions that require expensive taxpayer-funded infrastructure spending and subsidies, particularly at questionable environmental gains,” the groups wrote in a letter to Pruitt. “The American people deserve better, and if you do not act fast, come April 1, people across the state of California will be facing unrealistic and costly mandates which threaten their basic right to choose.”