Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. EPA Set to End California's Ability to Regulate Fuel Economy Associated Press WASHINGTON - The Trump administration is poised to revoke California's authority to set auto mileage standards, asserting that only the federal government has the power to regulate greenhouse gas emissions and fuel economy. Conservative and free-market groups have been asked to attend a formal announcement of the rollback set for Wednesday afternoon at Environmental Protection Agency headquarters in Washington. Gloria Bergquist, spokeswoman for the Alliance of Automobile Manufacturers, said Tuesday that her group was among those invited to the event featuring EPA Administrator Andrew Wheeler and Transportation Secretary Elaine Chao. The move comes after the Justice Department recently opened an antitrust investigation into a deal between California and four automakers for tougher pollution and related mileage requirements than those sought by President Donald Trump. Trump also has sought to relax Obama-era federal mileage standards nationwide, weakening a key effort by his Democratic predecessor to slow climate change. Top California officials and environmental groups pledged legal action to stop the rollback. The White House declined to comment Tuesday, referring questions to EPA. EPA's press office did not respond to a phone message and email seeking comment. .