John O. Brennan

It's not that the system is broken, but clearly there are ways to improve the system, strengthen it, to make sure that we can put together the various bits and pieces of information in a way that allows us to stop every single terrorist out there.

Our democratic values also include - and our national security demands - open and transparent government. Some information obviously needs to be protected. And since his first days in office, President Obama has worked to strike the proper balance between the security the American people deserve and the openness our democratic society expects.

By the time President Obama took office, Guantanamo was viewed internationally as a symbol of a counterterrorism approach that flouted our laws and strayed from our values, undercutting the perceived legitimacy - and therefore the effectiveness - of our efforts.

Obviously, the death of Usama Bin Laden marked a strategic milestone in our effort to defeat al-Qa'ida. Unfortunately, Bin Laden's death, and the death and capture of many other al-Qa'ida leaders and operatives, does not mark the end of that terrorist organization or its efforts to attack the United States and other countries.

I think the rule should be that if we're going to take actions overseas that result in the deaths of people, the United States should take responsibility for that.

Our counterterrorism tools do not exist in a vacuum. They are stronger and more sustainable when the American people understand and support them. They are weaker and less sustainable when the American people do not.