Limits of Citizenship

This is a pivotal time for the understanding of citizenship in our country (based on wisdom and legalities at least):

Judge Challenges White House Claims on Authority in Drone Killings – NYTimes.com:‘Are you saying that a U.S. citizen targeted by the United States in a foreign country has no constitutional rights?’ she asked Brian Hauck, a deputy assistant attorney general. ‘How broadly are you asserting the right of the United States to target an American citizen? Where is the limit to this?’