washington officials president donald trump administration will work congress attempt pass new authorization military operations islamic state u.s. senators say wednesday secretary state rex tillerson secretary defense jim mattis testify classify senate foreign relations committee hear write authorization fight militant group syria iraq express willingness work authorization take word democratic senator chris murphy tell reporters early wednesday state say letter committee republican chairman senator bob corker administration seek additional authorization revisions 2001 authorization use military force aumf unite state sufficient legal authority prosecute campaign al-qa ida associate force include islamic state iraq syria write charles faulkner department bureau legislative affairs 2001 aumf pass days sept. 11 attack authorize fight al qaeda affiliate use presidents since legal basis wide range military action members congress argue long past time repeal 16-year-old authorization especially campaign islamic state exist 2001 actually fight al qaeda syria elsewhere constitution give congress president right approve military action lawmakers struggle white house big say foreign policy corker say tillerson mattis open new aumf write appropriate way say administration seek aumf ... confident work us clear new aumf could pass senate house representatives attempt recent years come nothing disagreements even within committee proceed republican senator ron johnson say believe 2001 authorization apply anti-is campaign democratic senator tim kaine lead advocate new aumf say mattis military leaders agree congressional action would send message resolve u.s. adversaries ally support troop think mission would good congress engage kaine say trump admin will work congress war authorization lawmakers