istanbul u.s. secretary state rex tillerson visit turkey march 30 turkish foreign minister mevlut cavusoglu say thursday likely high-level meet ankara since u.s. president donald trump take office january tie unite state turkey second large army nato alliance key u.s.-led fight islamic state syria iraq deteriorate sharply last year barack obama administration rex tillerson say would like come turkey march 30 cavusoglu say interview broadcaster haberturk tell ankara available would happily host cavusoglu say tillerson likely also meet turkish president tayyip erdogan prime minister binali yildirim say erdogan turkish government want unite state extradite fethullah gulen u.s.-based islamic cleric ankara blame orchestrate last year fail coup gulen deny involvement coup attempt ankara also anger u.s. support kurdish ypg militia fight islamic state syria adamant washington switch support plan raqqa offensive ypg militia syrian rebel turkey train u.s. administration nervous whether turkish-backed force large enough sufficiently train decision set trump wish quick battlefield victories need maintain strategic alliance turkey ankara view ypg syrian extension kurdish pkk militant group fight insurgency turkey southeast since 1984 consider terrorist group unite state european union erdogan believe tie improve trump phone call two early last month positive source erdogan office say u.s. secretary state visit turkey march 30 say turkish minister