John O. Brennan said this quote

Unfortunately, in war, there are casualties, including among the civilian population.

~ John O. Brennan

Where terrorists offer injustice, disorder and destruction, the United States and its allies stand for freedom, fairness, equality, hope, and opportunity.

~ John O. Brennan

I will not, nor will I ever, publicly divulge sensitive intelligence sources and methods. For when that happens, our national security is endangered and lives can be lost.

~ John O. Brennan

I do not - I never believed it's better to kill a terrorist than to detain him. We want to detain as many terrorists as possible so we can elicit the intelligence from them in the appropriate manner so that we can disrupt follow-on terrorist attacks.

~ John O. Brennan