"Democratic attorneys general from 20 states and the District of Columbia on Thursday filed a motion to intervene in a lawsuit from Republican attorneys general against the Environmental Protection Agency (EPA) over California’s vehicle emissions standards.  

The Democrats, led by California Attorney General Rob Bonta, filed the motion in defense of the state’s standards, which are stricter than federal standards.

The Trump administration had in 2019 revoked a 2013 waiver allowing the state to impose more stringent standards than the federal government, but EPA Administrator Michael Regan reversed the revocation in March after announcing in 2021 that the EPA would review the decision."

Zack Budryk reports for The Hill May 19, 2022. [2]