"Iraq and Turkey should continue seeking to clarify the situation and find an appropriate resolution. It is important to remain focused on the priority of fighting ISIL," the official said.
The official stressed that both the United States and Turkey support the territorial integrity of Iraq.
"We do not support any military deployment inside Iraq absent consent of the Iraqi government. This includes the deployment of US military personnel, as well as military personnel from any neighboring country," the official added.
The State Department had no further comment on the possible cancellation of US-Iraq agreement on security.
On December 4, Turkey deployed about 150 troops and 25 tanks to northern Iraq, reportedly to help train Iraqi soldiers to retake the city of Mosul from the Daesh, also known as ISIL/The Islamic State, a terrorist group outlawed in Russia. Following the deployment, Prime Minister Haider Abadi demanded the withdrawal of the Turkish troops, which were moved into the country without authorization of the Iraqi government.