California is taking the Trump administration to court again, this time over the administration's blocking of the state's ...

Trump signed measures Thursday revoking waivers for the state's mandates that clean up car and truck exhaust and ramp up ...

President Donald Trump signed a resolution on Thursday that blocks California’s first-in-the-nation rule banning the sale of ...

A coalition of 11 U.S. states has filed a lawsuit against President Trump over the repeal of California's authority to enforce its own emissions standards.

Washington AG Nick Brown joined a lawsuit against Trump's challenge to California's vehicle emissions standards.

The move sets up another battle with Gov. Gavin Newsom, who has sparred with Trump in recent days over the president’s ...

The lawsuit seeks to preserve states' clean vehicle programs. A brief supports California's challenge of Trump's authority to ...

Congress rescinding Clean Air Act waivers negates regulations to transition gasoline and diesel vehicles to electric ones.