U.S. Secretary of State Rex Tillerson made the request on Friday, during a phone call with the president of Iraq's Kurdistan Regional Government, Massoud Barzani.
The U.S. State Department said in June it was concerned that the referendum will distract from "more urgent priorities" such as the defeat of Islamic State militants.
The United States and other Western nations are concerned that the vote could turn into another regional flashpoint. Turkey, Iran and Syria, which together with Iraq have sizeable Kurdish populations, all oppose an independent Kurdistan.
(Reporting by Maher Chmaytelli; Editing by Adrian Croft) ((email@example.com; +9647901917030;))
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