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

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

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

by ABC News Videos 2:47 mins

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

by ABC News Videos 2:47 mins

As the US conducts more airstrikes on ISIS targets the number of westerners joining extremist groups is on the rise.

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