"As the Attorney General of Oklahoma, Pruitt has shown he is not only a relentless opponent of EPA standards for climate pollution. He has been a relentless opponent of basic pollution limits as well, the kind that protect us from mercury, smog, arsenic and other deadly air toxics. He questions whether toxic mercury pollution is hazardous to public health. He shut down his office’s Environmental Protection Unit. And now he wants to do for the United States what he did for Oklahoma."