John O. Brennan

Any American who joins al Qaeda will know full well that they have joined an organization that is at war with the United States. Any American who did that should know well that they in fact are part of an enemy... and that the U.S. will do anything that is possible to destroy that enemy to save American lives.

To me, terrorists should not be able to hide behind their passports and their citizenship, and that includes U.S. citizens, whether they are overseas or whether they are here in the United States. What we need to do is to apply the appropriate tool and the appropriate response.