The former coal lobbyist, who has been a champion of Trump's deregulatory agenda without any of the ethical scandals of his predecessor, is all but guaranteed a confirmation.
The Trump administration has been systematically rolling back environmental regulations, and now carbon emissions are up across every sector in America.
The letter comes one week after the EPA announced that it would not enforce a 2016 regulation that limits the manufacture of diesel freight trucks refurbished with older engines.
Given their narrow majority, Senate Republicans prefer to let Andrew Wheeler continue as acting administrator rather than squeeze in another confirmation fight before the November mid-terms.
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