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ISIS is the greatest threat.

Terrorism is a significant threat to peace and security, prosperity and people.

Look, we constantly live looking at the issue of the threat of terrorism.

Given the level of anti-Americanism in the world, given the level of frustration with the United States throughout the Muslim world, you've got a homegrown attack or you have a nuclear explosion in the air that is not a test somewhere. Those are still the biggest threats out there.

Despite fearful rhetoric to the contrary, terrorism is not a transcendent threat. A terrorist attack cannot possibly destroy our country's way of life; it's only our reaction to that attack that can do that kind of damage.

Terrorists are always a threat to someone. If we'll be scared of them, it means they have won.

The threat from radical Islamic jihadists is real and needs to be taken seriously.

The uncertainty of the danger belongs to the essence of terrorism.

The fact of the matter is that the United States faces real threats from criminals, terrorists, spies, and malicious cyber actors.