washington unite state trouble report iranian-american man may sentence iran 18 years prison state department spokesman say tuesday week iranian-american businessman father also jail iranian court trouble report robin reza shahini person report u.s. citizen may convict sentence 18 years prison spokesman john kirby tell daily brief call tehran halt arbitrary politically motivate detentions california-based shahini detain visit mother gorgan july accord shahini friends last week businessman siamak namazi 80-year-old father baquer namazi former iranian provincial governor former unicef official sentence 10 years prison charge cooperate unite state iran recognize dual nationality prevent western embassies visit detainees washington secure release five u.s. citizens iran january prisoner exchange say raise detention americans hold tehran meet iranian officials major world power include unite state reach landmark nuclear deal iran july last year lift international sanction iran nobody turn blind eye behind think us know certainty kirby say ask iran keep detain dual citizens speak motivation behind detentions one motivations secure ransom false perception wrong republican leaders u.s. house representatives plan vote soon mid-november 10-year reauthorization iran sanction act congressional aid tell reuters move could increase frustrations iran complain months remain u.s. sanction frighten away trade partner u.s. say trouble report another u.s. citizen jail iran