washington unite state monday urge iraq federal government kurdish regional government institutions resolve disagreements iraqi kurdish leader masoud barzani say would resign late week call kurdish party support krg work resolve pending issue remainder term prepare elections 2018 u.s. state department spokeswoman heather nauert say statement commend barzani decision urge iraq krg work urgently resolve pending issue iraqi constitution statement appear reflect u.s. belief departure barzani whose sept. 25 independence referendum widely see backfire may make easy two main kurdish factions work together negotiate federal government lead prime minister haider al-abadi statement nauert stress u.s. desire work krg prime minister nechirvan barzani masoud barzani nephew fellow member kurdistan democratic party kdp faction deputy prime minister qubad talabani member faction patriotic union kurdistan puk strong krg within unify federal iraq essential long-term stability endure defeat isis say refer islamic state militant group whose destruction major u.s. policy objective region dispute krg baghdad federal government range perennial tussle share oil revenues control territory border cross suggest barzani departure may yield great kurdish unity improve odds resolution baghdad u.s. official say allow tension continue able find way live together time get sit try work things u.s. urge cooperation kurdish leader 's resignation