The Supreme Court has declined to take up an effort by Republican-led states to revoke California’s authority to set ...

Supreme Court dismisses a red-state constitutional claim that targeted California's power to fight air pollution.

The Supreme Court will decide whether liquid-fuel companies have legal standing to challenge California regulations requiring ...

The Supreme Court declined Monday to take up an appeal from conservative states challenging California’s ability to establish ...

The justices said they will hear a key preliminary question in a lawsuit over the Environmental Protection Agency’s power to ...

Critics of the state's power to set stricter air pollution standards than the federal government say they hope the justices ...

Ohio and 16 other Republican-dominated states have sued, asserting that a waiver granted to California to set its own rules ...

The petition to the high court says indigent clients are losing due process rights because they don’t have verbatim records ...

The U.S. Supreme Court agreed on Friday to hear a bid by fuel producers to challenge California's standards for vehicle ...

California wants to move away from gas-powered cars. But 'the Golden State is not the golden child,' 17 states complained to ...

Stepping into a legal fight that has been raging for years, the Supreme Court said it would decide whether California can set ...

The Supreme Court on Friday said it would take up a business-backed appeal that could make it easier to challenge federal ...