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President Obama Responds to James Foley's Execution, Promising to be "Vigilant and Relentless."

As the US conducts more airstrikes on ISIS targets the number of westerners joining extremist groups is on the rise.
02:41 | 08/20/2014

Transcript for President Obama Responds to James Foley's Execution, Promising to be "Vigilant and Relentless."

And now, the question continues. What is the U.S. Going to do. Isis is now estimated to be more than 10,000 strong and growing. Have taken over a third of Iraq and parts of Syria. Jonathan Karl breaks... See More
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