As a presidential candidate, Donald Trump spent a lot of time currying the favor of the ethanol industry, barnstorming its rural Midwest base and repeatedly expressing his support for biofuels made from corn and soybeans. He was rewarded in November: Of the 184 counties with an ethanol plant in the U.S., 95 percent voted for Trump, according to data compiled by the Renewable Fuels Association . An error has occurred You have 1 free Businessweek article left. Register for more. Register or Sign In Already a subscriber? Link your Bloomberg Terminal account or your Businessweek subscription account to access all articles. As president, Trump has continued to pledge that he’ll protect the Renewable Fuel Standard, the 2005 law that requires U.S. oil refineries to blend increasing amounts of ethanol and biodiesel into the nation’s fuel supply. In its 12-year history, the RFS has gained critics on both sides of […]