Getty ImagesWASHINGTON, D.C. - The Justice Department has opened an antitrust investigation into four major automakers who have rejected the Trump administration's relaxed air pollution and mileage regulations.
The automakers also face even tougher emission rules from overseas auto regulators, some of which would require all cars to be electrified in the future.
But the deal between the automakers and California clearly angered President Donald Trump, who lashed out at the automakers in a number of tweets last month following their deal.
The California Air Resources Board, or CARB, announced the deal with the automakers on July 25, and called on other automakers to agree to it as well.
The California Air Resources Board did not immediately respond to a request for comment on Friday.