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U.S. President Barack Obama pauses while speaking at American University's School of International Service in Washington, D.C., U.S., on Wednesday, Aug. 5, 2015. Obama's speech, held at the same venue in which President Kennedy delivered his famous 1963 speech on nuclear disarmament, focuses on the Iran Nuclear Deal being debated in Congress. Photographer: Pete Marovich/Bloomberg via Getty Images

U.S. President Barack Obama pauses while speaking at American University's School of International Service in Washington, D.C., U.S., on Wednesday, Aug. 5, 2015. Obama's speech, held at the same venue in which President Kennedy delivered his famous 1963 speech on nuclear disarmament, focuses on the Iran Nuclear Deal being debated in Congress. Photographer: Pete Marovich/Bloomberg via Getty Images