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Also note that, in contrast to some previous AUMFs, the 2002 AUMF has no geographical limitation. It authorizes force not in Iraq, but rather “against the continuing threat posed by Iraq.” To the extent that the “continuing threat posed by Iraq” is today constituted by ISIS forces operating in tandem (and under a single military structure) in Iraq and Syria, the statute arguably authorizes the use of force against ISIS in Syria. Put another way, the 2002 Iraq AUMF arguably authorizes force against ISIS in Syria if the President determines that such force is necessary and appropriate to defend the national security of the United States against the continuing threat posed by Iraq. It is not hard to imagine that the President could make that determination.
(Note that Section 3(b) of the 2002 AUMF further requires the President to make certain determinations and report them to Congress, but those determinations would be easy to satisfy if the President deemed force to be necessary and appropriate.)
PS: To say that the 2002 AUMF authorizes the President to use force in Iraq and possibly Syria does not mean that he should use force there -- only that he has the statutory authority to do so.
UPDATE: According to The Guardian, a bombing campaign against ISIS in Syria is a live possibility: “Senior US officials told the Guardian that an air campaign was under serious discussion, possibly targeting fighters not just in Iraq but in Syria, where they have seized swaths of territory in the past two years.”