A man walks in front of the United State Embassy in Ankara, on October 9, 2017 as United States and Turkey mutually suspended visa services. (AFP PHOTO)

ISTANBUL, Oct. 12 (Xinhua) -- Turkey's presidential spokesman Ibrahim Kalin said on Thursday that Turkey has received the request of the United States to solve the ongoing visa spat between the two NATO allies.

"We will assess it and evaluate it in detail," Kalin told reporters in Istanbul, saying the ongoing row was not complicated for Turkey and "could be solved in one day."

Turkish Foreign Minister Mevlut Cavusoglu and his U.S. counterpart Rex Tillerson discussed the issue over the phone on Wednesday, marking the first contact between Ankara and Washington since the two sides announced a suspension of all non-immigrant visa applications for each other's citizens on Sunday.

The spat erupted after Turkey arrested a Turkish national working with the U.S. consulate general in Istanbul last week over alleged link to the network led by the U.S.-based Turkish cleric Fetullah Gulen, who is accused by Ankara of masterminding a coup attempt last year.

On Monday, Istanbul prosecutors summoned another Turkish national working for the U.S. consulate to testify.

On the ongoing judicial process against Turks working for the U.S. mission, Kalin said, "It is not possible to understand the U.S. move in connecting these latest developments to the visa issue or the security of the personnel working at the U.S. embassy."

"The employees in question are Turkish and not the U.S. citizens," the spokesman added.