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Iraqi Kurdish forces take part in an operation backed by US-led strikes in the northern Iraqi town of Sinjar on November 12, 2015, to retake the town from the Islamic State group and cut a key supply line to Syria. The autonomous Kurdish region's security council said up to 7,500 Kurdish fighters would take part in the operation, which aims to retake Sinjar "and establish a significant buffer zone to protect the (town) and its inhabitants from incoming artillery." AFP PHOTO / SAFIN HAMED        (Photo credit should read SAFIN HAMED/AFP/Getty Images)
Iraqi Kurdish forces take part in an operation backed by US-led strikes in the northern Iraqi town of Sinjar on November 12, 2015, to retake the town from the Islamic State group and cut a key supply line to Syria. The autonomous Kurdish region's security council said up to 7,500 Kurdish fighters would take part in the operation, which aims to retake Sinjar "and establish a significant buffer zone to protect the (town) and its inhabitants from incoming artillery." AFP PHOTO / SAFIN HAMED        (Photo credit should read SAFIN HAMED/AFP/Getty Images)

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Fmr. SEAL Cmdr.: ISIS becoming biggest U.S. threat

Republican Congressman and former Navy Seal Commander Ryan Zinke tells Jake Tapper that ISIS is quickly becoming the biggest security threat to the U.S. with its latest attacks.

Fmr. SEAL Cmdr.: ISIS becoming biggest U.S. threat

Republican Congressman and former Navy Seal Commander Ryan Zinke tells Jake Tapper that ISIS is quickly becoming the biggest security threat to the U.S. with its latest attacks.