However, perhaps the most important question to ask as Trump enters office is not what the President wants to do, but what exactly he can do. In the execution of national security and foreign policy initiatives, this question becomes particularly important. Since the end of World War II, U.S. presidents have progressively expanded the reach of executive authority over the levers of foreign policy and national security and, in the 15 years since 9/11, that authority has only deepened.

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