Brian Thalmann has been selling corn for ethanol for two decades. In that time the farmer from Plato, Minn., says he has never seen an attack on renewable fuel like the one currently underway by the U.S. Environmental Protection Agency (EPA). Using a secretive process, EPA Administrator Scott Pruitt has increased the issuance of waivers to small oil refineries, absolving them from meeting federal standards that require blending ethanol with gasoline. Corn farmers and ethanol producers across Minnesota, fearing a financial hit, are crying foul.