The president’s office released this statement, justifying the engagement in Libya: "The President is of the view that the current U.S. military operations in Libya are consistent with the War Powers Resolution and do not under that law require further congressional authorization, because U.S. military operations are distinct from the kind of “hostilities” contemplated by the Resolution’s 60 day termination provision. U.S. forces are playing a constrained and supporting role in a multinational coalition, whose operations are both legitimated by and limited to the terms of a United Nations Security Council Resolution that authorizes the use of force solely to protect civilians and civilian populated areas under attack or threat of attack and to enforce a no-fly zone and an arms embargo. U.S. operations do not involve sustained fighting or active exchanges of fire with hostile forces, nor do they involve the presence of U.S. ground troops, U.S. casualties or a serious threat thereof, or any significant chance of escalation into a conflict characterized by those factors." 1  As such it is justifiable to say that the conflict in Libya do not amount to legal hostilities. Secondly, the U.S. gave control of the operation in Libya to NATO on April 1st 2011. As such the U.S. government is not in violation of U.S. laws as it is not the U.S. prosecuting hostilities should they be considered to be happening. It is instead NATO doing it. Given that NATO is part of U.S. spending and that NATO commitments require contribution from all member states in some way, the U.S. does not have to justify the engagement in law as the U.S. is not culpable for its participation, NATO is.  Further, whilst regime change was a consequence in Libya, it was not the military objective of the campaign in Libya, which was to simply limit Gadaffi’s ability to use aircraft to visit harm upon his citizens. Regime change was just a happy coincidence that benefitted the people in Libya. As such the conflict did not amount to “hostilities” as U.S. participation in said conflict was incredibly limited. 2  BBC News, ‘Libya: Obama says US intervention will be limited’, 29 March 2011,  Obama Administration letter to Congress justifying Libya engagement, 15/06/2011