Republican attorneys general and conservative legal activists are plotting ways to challenge other environmental regulations on similar grounds, setting up a larger legal showdown over the federal government's ability to address the climate crisis.
The states are arguing that the Trump administration doesn't have the legal authority to strip California of its longstanding authority to set strict fuel-efficiency standards on cars and trucks.
Saying California has the worst air quality in the country, the E.P.A. chief fires the latest salvo in an escalating battle over clean air and states’ rights.
