For over two centuries, the United States has been bound together by founding documents that defined who we are as Americans, and served as our compass through every type of change. Matters of war and peace are no different. Americans are deeply ambivalent about war, but having fought for our independence, we know a price must be paid for freedom. From the Civil War to our struggle against fascism, on through the long twilight struggle of the Cold War, battlefields have changed and technology has evolved. But our commitment to constitutional principles has weathered every war, and every war has come to an end. (..)

The AUMF is now nearly 12 years old. The Afghan war is coming to an end. Core al Qaeda is a shell of its former self. Groups like AQAP must be dealt with, but in the years to come, not every collection of thugs that labels themselves al Qaeda will pose a credible threat to the United States. Unless we discipline our thinking, our definitions, our actions, we may be drawn into more wars we don’t need to fight, or continue to grant Presidents unbound powers more suited for traditional armed conflicts between nation states.

So I look forward to engaging Congress and the American people in efforts to refine, and ultimately repeal, the AUMF’s mandate. And I will not sign laws designed to expand this mandate further. Our systematic effort to dismantle terrorist organizations must continue. But this war, like all wars, must end.