The Trump administration began the process of revising Obama-era fuel economy standards for vehicle manufacturers today, and announced it may revoke California's waiver that allows that state to set its own emissions rules.

The move would roll-back more stringent regulations in the Corporate Average Fuel Economy (CAFE) standards that were enacted during the Obama presidency. U.S. Environmental Protection Agency chief Scott Pruitt announced the decision in an April 2 statement obtained by Bloomberg. The move had been expected.

"Obama's EPA cut the midterm evaluation process short with politically charged expediency, made assumptions about the standards that didn’t comport with reality and set the standards too high," Pruitt said.

The Obama-era rules had rankled automakers because they aimed to reduce emissions from cars and light trucks by requiring a fleet average of 50 miles per gallon by 2025.

Pruitt said the EPA will draft new rules for 2022 to 2025 with National Highway Traffic Safety Administration.