washington chairman u.s. senate foreign relations committee say monday would block arm sales saudi arabia unite arab emirates members gulf cooperation council pending progress resolve simmer dispute qatar countries region need combat terrorism recent dispute among gcc countries serve hurt efforts fight isis counter iran republican senator bob corker write letter secretary state rex tillerson action could increase pressure members gulf cooperation council settle crisis gcc group saudi arabia kuwait unite arab emirates qatar bahrain oman saudi arabia egypt bahrain unite arab emirates impose boycott qatar tiny wealthy neighbor june accuse support terrorism send 13 demand include close al jazeera television curb relations iran pay reparations u.s. law major foreign u.s. arm sales submit review small group lawmakers include chairman foreign relations committee go ahead trump consider corker potential vice president secretary state work closely white house administration would unlikely ignore resistance arm sales u.s. officials say consider statement part broad effort solve qatar crisis state department official note tillerson call sunday countries involve sit together discuss ways forward official decline comment arm sales beyond say department remain commit work lawmakers immediately clear sales would affect trump announce billions dollars arm sales since take office january see weapons sales way create job unite state corker aide say action would affect sales already review congress non-lethal assistance include train one sale already clear congress 350 billion precision-guided munition offensive weapons saudi arabia letter corker say please trump recent trip saudi arabia include gcc summit unfortunately gcc take advantage summit instead choose devolve conflict corker write republican senator block arm sales qatar crisis