The move has been opposed by oil companies and environmentalists, who object that it could lead to higher prices at the gas pumps and increase air pollution during the summer months when 15% ethanol fuels had been banned. They are expected to sue to try to block the move. The decision could be a boon to farmers in places like Iowa, the No. 1 corn and ethanol-producing state that Mr. Trump won in the 2016 election and needs in the 2020 election. Mr. Trump plans to talk up the new policy in coming trips to Iowa and other farm-belt states, say people familiar with those plans. EPA Administrator Andrew Wheeler said the changes weren’t motivated by political considerations or to appease farmers who have lost crop sales as a result of retaliatory tariffs China imposed on U.S. crops. He framed the rule changes as a fix to a troubled […]