The Trump administration unveiled a fuel proposal Friday that would buoy corn farmers and ethanol producers while alienating the nation’s oil industry. The proposal from the Environmental Protection Agency (EPA) would require oil refineries to blend more ethanol into gasoline, a minimum of 15 billion gallons of each year. The rollout marks the latest twist in a months-long feud between two groups viewed by President Trump as key supporters in his base: farmers and the oil and gas industry. “Once again the president has demonstrated he’s a champion for our nation’s farmers and for rural America,” a senior EPA official...