new york wealthy turkish gold trader decision hire former new york city mayor rudolph giuliani former u.s. attorney general michael mukasey represent defend charge conspire violate u.s. sanction iran raise potential conflict interest prosecutors say least eight big bank allegedly victimize trader reza zarrab current former clients giuliani mukasey law firm act u.s. attorney joon kim manhattan say letter date monday federal judge hear case bank relationships law firm require special hear know curcio hear make sure zarrab understand potential conflict kim say giuliani lawyer greenberg traurig mukasey also former federal judge lawyer debevoise plimpton neither firm immediate comment eight bank bank america corp citigroup inc deutsche bank ag hsbc hold plc jpmorgan chase co standard charter plc ubs group ag well fargo co. various deceptive act include layer transactions omit information concern iranian nexus zarrab co-conspirators allegedly trick numerous u.s. financial institutions process bar transactions thus expose significant potential loss kim say letter u.s. district judge richard berman explain potential conflict interest prosecutors accuse iranian-born zarrab two others engage hundreds millions dollars transactions iran government iranian entities 2010 2015 scheme evade u.s. sanction trial schedule aug. 21. zarrab federal custody since march 21 2016 arrest miami en route disney world wife daughter hold curcio hear could eliminate one grind appeal case go zarrab case closely watch turkey zarrab arrest 2013 corruption probe individuals close tie tayyip erdogan turkey prime minister president zarrab dual national iran turkey another lawyer zarrab benjamin brafman say letter monday giuliani mukasey roles require appearance court accordingly hear require case u.s. v. zarrab u.s. district court southern district new york 15-cr-00867 turkish gold trader hire giuliani mukasey u.s. sanction case