Not only is California's phase-out of internal-combustion vehicles by 2035 in the crosshairs, its ability to set its own environmental standards is, too.

California Gov. Gavin Newsom and state Attorney General Rob Bonta announced Thursday plans to file a lawsuit in response to the Senate blocking the state's first-in-the-nation rule banning the sale of new gas-powered cars by 2035.

A waiver from the federal government has long allowed California to set its own stricter tailpipe emissions. But now, fuel companies are suing. On Wednesday, the Supreme Court will weigh whether ...

The Republican-controlled U.S. House voted Thursday to block California from enforcing first-in-the-nation rules phasing out ... standards to cut tailpipe emissions from medium- and heavy-duty ...

U.S. Supreme Court justices appeared sympathetic on Wednesday to a bid by fuel producers to challenge California's standards for vehicle emissions and electric cars under a federal air pollution law in a case involving the Democratic-governed state's power to fight greenhouse gases.