A Copper Smelter in Miami, Arizona, Faced Tighter Rules. Then Trump Intervened.
The president exempted a copper smelter in Arizona from air-quality rules. An E.P.A. official guided the company that sought the exemption, emails show.
The president exempted a copper smelter in Arizona from air-quality rules. An E.P.A. official guided the company that sought the exemption, emails show.
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