The call occurred after USA -backed militias in Syria said they had come under attack on Saturday from Russian jets and Syrian government forces in Deir al-Zor province, a flashpoint in an increasingly complex battlefield. The U.S. citizen is being legally detained by Department of Defense personnel as a known enemy combatant.
On Thursday, the chief spokesman for the USA military command referred all questions about the news.
A State Department official told CNN that it was aware of the reports but had "no information to share at this time", while the Justice Department and Federal Bureau of Investigation also declined the network's request for comment.
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"We are aware that a USA citizen surrendered to the SDF on or about September 12", the official told AFP on condition of anonymity.
Fox News reported two military officials confirming that a us citizen believed to have joined up with ISIS was being held by the SDF. The vast majority have been from the Middle East and North Africa, with substantial numbers from Europe and former Soviet republics with large Muslim populations. He fled to Turkey before returning to Syria and joining the SDF.
He added, however, that as the two groups converge on the Islamic State position from opposite sides, it will get more hard to stay out of each other's way.
The spokesperson for the coalition tweeted on Tuesday that "SDF hold more than 60 percent of Raqqa; 35 blocks cleared of ISIS this week". This week it sentenced a Russian-born Islamic State fighter to death.
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While a few others have defected or been captured, Hughes said this new fighter could provide valuable intelligence.
It is not the first time an American citizen fighting for IS has been detained.
The prisoner whose detention was announced Thursday is the first known to have been captured under the Trump administration.
This undated file image posted on a militant website on January 14, 2014, which has been verified and is consistent with other AP reporting, shows fighters from the al-Qaida linked Islamic State in Raqqa, Syria.
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The current location of the U.S. citizen has not been released. "Air power will be the main determining factor".