They don't have the legislative majority to repeal the Clean Air Act -- one of the most successful and popular laws in US history -- so they are simply destroying it by other means.
Trump Pardons Violators of the...
www.nytimes.comTrump Pardons Violators of the Clean Air Act and a Major DonorThe president used his clemency power to further undermine environmental laws and to help a political supporter who pleaded guilty in a fraud involving Jack Abramoff.