We have to be mindful that there is the certainty that terrorists will attempt to launch multiple attacks against their enemy, which is us and our allies.

We worked to develop our own operations to advance U.S. counterterrorism objectives by penetrating terrorist safe havens and collecting intelligence that would inform policy and enable our own operations.

As long as there are people who are not happy with their lot in life, as long as the United States is perceived to somehow be the cause of this unhappiness, there will be terrorism.

We have to be mindful that there is the certainty that terrorists will attempt to launch multiple attacks against their enemy, which is us and our allies.

The only way to address terrorism is to deal with the issues that create terrorism, to resolve them where possible, and where that's not possible to ensure that there is an alternative to violence.

Cyber will be part of any future conflict - whether it's a nation state or terrorism.

I was an intelligence officer, not a policy-maker.