Also killed in the attack were Army Chief Warrant Officer 2 Jonathan R. Farmer, 37, of Boynton Beach, Florida., who was based at Fort Campbell, Kentucky, and a civilian, Scott A. Wirtz, from St. Louis, Missouri.
In that call, and while the former envoy was in Iraq, Mr Pompeo "informed us that there had been a sudden change in plans: President Trump, after a phone conversation with his Turkish counterpart, planned to declare victory over the Islamic State and direct our forces to withdraw from Syria".
"We are certainly aware that as we constrict and destroy the last remnants of the caliphate that ISIS has moved toward an insurgency", one official said, using an alternative name for the Islamic State.
The Kurdish fighters who spoke to D'Agata in northern Syria are not only concerned that the withdrawal of USA troops could enable an ISIS comeback, but that Turkish forces will go on the attack the moment the last American soldier leaves.
Trump addressed the deaths during remarks at the Pentagon on missile defense strategy Thursday. "We will never forget their noble and immortal sacrifice", he said.
The vice president also criticized China's "unfair" trade practices and loans to developing countries that pushed up their debt levels as it tries to gain greater influence in the world. Wirtz had completed multiple deployments for the agency in the Middle East after leaving the Navy. While the USA suspects an ISIS sleeper cell was responsible for the latest attack, according to one official, it is not clear how prevalent ISIS remains in the immediate area and what operation would have required a team with such highly technical and intelligence expertise.
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In separate statements later, both the White House and Pence condemned the attack and expressed sympathy for the deaths of the USA personnel.
The Manbij attack on US forces in Syria appeared to be the deadliest since they deployed on the ground there in 2015.
Paul said Trump told the group, "We're not going to continue the way we've done it".
Pence said the administration's foreign policy was based on Trump's "America First" agenda.
A third of Americans say they have heard a lot about the possible withdrawal of USA troops, while 46% say they have heard a little; 19% say they have heard nothing about this.
They were on a classified mission to "kill or capture a known ISIS member", according to a Pentagon official at the time.
There are still some 2,000 American troops in Syria, but the USA has already begun the process of withdrawing from the region, pulling equipment from the northeast of the country into neighboring Iraq. Mixed Kurdish-Arab Syrian forces liberated Manbij from ISIS in 2016 with the help from the USA -led coalition.