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    Fmr. DHS head: Growing risk of lone wolf attacks in U.S.

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Fmr. DHS head: Growing risk of lone wolf attacks in U.S.

Former Homeland Security Secretary Michael Chertoff on CNN's "The Lead with Jake Tapper."

Fmr. DHS head: Growing risk of lone wolf attacks in U.S.

Former Homeland Security Secretary Michael Chertoff on CNN's "The Lead with Jake Tapper."