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Sen. John Barrasso (R-Wyo.) expressed concern Sunday that an Islamist extremist group causing chaos in Iraq will attack the United States.

“My greatest concern is for what he intends to do and I think he has the capability to and the intent to attack the United States,” he said on “Fox News Sunday.”

On Sunday, Iraqi officials were working to confirm the authenticity of a 21-minute video said to show Abu Bakr al-Baghdadi, the head of the Islamic State in Iraq and Syria (ISIS) group.