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ANKARA (Reuters) - Turkish President Tayyip Erdogan on Wednesday told U.S. Secretary of Defence James Mattis that Turkey felt unease over U.S. support for Kurdish militant group YPG, presidential sources said.

In a statement following meetings between Mattis and Turkish officials, the sources said the two sides emphasized the importance of maintaining the territorial integrity of Syria and Iraq, as Kurdish northern Iraq gears up for an independence referendum in September.

Both Turkey and the United States have voiced concerns over the referendum, with the former’s Foreign Minister, Mevlut Cavusoglu, saying earlier on Wednesday he would ask Iraqi Kurdish leader Massoud Barzani to cancel it.