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Homeland Security Chief: Threat of Attack Keeps Me Up

Homeland Security Chief: San Bernardino or Orlando Keep Me Up 1:42

On the 15th anniversary of 9/11, Homeland Security Secretary Jeh Johnson said the nation is safer today from a similar coordinated terrorist attack but said America remains "challenged when it comes to the prospects of the lone-wolf actor, the home-grown violent extremist." And he said that threat "requires a new whole of government response and public participation and vigilance, as well."

Johnson said the government has "people devoted to all manner of threats out there," but said the possibility of more incidents like the mass shootings in San Bernardino or Orlando "is upper most on our minds. It is the thing that keeps me up at night the most."

"But we've got threats from, you know, cyber-security. We've got a mission devoted to the potential for bio threats, a dirty bomb. We've got to keep our eye on all of it. But obviously, there are things that are higher probability, there are things that are lower probability, but higher impact. And we've got to keep our eye on all of it."