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    DHS Secretary: 'You have to be vigilant'

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DHS Secretary: 'You have to be vigilant'

Homeland Security Secretary Jeh Johnson speaks to CNN's Gloria Borger on terror group Al-Shabaab's threat to attack western shopping malls.

DHS Secretary: 'You have to be vigilant'

Homeland Security Secretary Jeh Johnson speaks to CNN's Gloria Borger on terror group Al-Shabaab's threat to attack western shopping malls.