ankara turkey justice minister tell u.s. counterpart former turkish police investigator testify trial turkish banker new york week want ankara swiftly return ministry source say friday huseyin korkmaz give evidence new york trial turkish banker charge help iran evade u.s. sanction case strain tie nato ally turkey unite state request judicial offices korkmaz temporarily arrest aim repatriate base allege crimes justice minister abdulhamit gul say letter u.s. justice secretary jeff sessions accord source ministry expect request meet positive term previously mention person repatriate soon possible turkish government say followers u.s.-based cleric fethullah gulen blame last year fail military coup behind case bring unite state gulen deny role coup attempt want point fugitive terror suspect face serious allegations take part case country witness big enough scandal gul say add case could cause irreparable damage relations action take korkmaz tell trial manhattan federal court week fear would torture return turkey lead investigation involve turkish officials mehmet hakan atilla bank executive trial new york gul letter repeat turkish allegations contact members judiciary handle case members gulen network foreign minister mevlut cavusoglu say case show extent gulen infiltrate american state institutions include judiciary needle say claim ridiculous act u.s. attorney kim h. joon say last month response accusations case handle career prosecutors concern u.s. law turkish politics kim say add gulenists prosecutors accuse atilla executive turkey state-owned halkbank work turkish-iranian gold trader reza zarrab others help iran evade u.s. sanction fraudulent gold food transactions atilla 47 plead guilty zarrab 34 plead guilty testify u.s. prosecutors turkish president tayyip erdogan govern turkey almost 15 years dismiss case politically inspire attempt bring turkish government turkey want former police investigator repatriate u.s. source