Rep Michael McCaul: ISIS 'External Operations' Underway to Hit West

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Rep Michael McCaul: ISIS 'External Operations' Underway to Hit West

Rep Michael McCaul: ISIS 'External Operations' Underway to Hit West
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Rep Michael McCaul: ISIS 'External Operations' Underway to Hit West

by ABC News Videos 7:38 mins

Rep Michael McCaul: ISIS 'External Operations' Underway to Hit West

by ABC News Videos 7:38 mins

The House Homeland Security Committee chair on the threat to the U.S. from ISIS.

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