nine u.s. senators state oil refineries send letter president donald trump thursday urge change country biofuels policy ask meet discuss issue letter reflect grow tensions refiners oppose u.s. renewable fuel standard law require blend increase amount ethanol nation fuel year midwest corn lobby support trump administration bow rise pressure midwest lawmakers last week assure letter phone call would ditch proposals support refine industry overhaul biofuels policy senators say decision could cost job administration make adjustments reform matter relate renewable fuel standard result loss job around country particularly state accord letter sign texas senator ted cruz oklahoma senator jim inhofe pennsylvania senator pat toomey six others letter senators ask trump meet within next three weeks would include number midwest lawmakers relevant administration officials discuss pathway forward toward mutually agreeable solution white house official immediately respond request comment meet request renewable fuel standard implement former president george w. bush 2005 way support farmers reduce import combat climate change oil industry oppose regulation mainly increase biofuels volume mandate cut petroleum-based fuel market share number independent refiners like valero energy corp cvr energy pbf energy also vocally oppose regulation requirement refiners blend biofuels purchase credit rival say cost hundreds millions dollars year cvr majority owner billionaire carl icahn serve months top adviser donald trump regulation time push shift responsibility blend away refiners supply terminals distributors resign post summer concern dual role investor adviser environmental protection agency say last week believe shift blend requirement refiners appropriate epa also jettison proposal cut biofuels volumes mandate another count ethanol export mandate senators refinery state request trump meet biofuels