AG Eric Holder's response to Rand Paul."It has come to my attention that you have now asked an additional question: 'Does the President have the authority to use a weaponized drone to kill an American not engaged in combat on American soil?' The answer to that question is no,"
http://politicalticker.blogs.cnn.com/2013/03/07/obama-administration-responds-to-paul-on-drones/?hpt=hp_bn3