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In this photo released by official website of the office of the Iranian Presidency, President Hassan Rouhani, center, Science Minister Mohammad Farhadi, right, and head of the President's office Mohammad Nahavandian, left, listen to the national anthem at the start of a ceremony marking Student Day at Tehran University in Tehran, Iran, Tuesday, Dec. 6, 2016. Rouhani said Tuesday his country will not allow incoming U.S. President Donald Trump to "tear up" Tehran's landmark nuclear deal with world powers. His remarks underscore Iranian leaders' attempts to calm concerns over the future of the deal in the wake of Trump's election. (Iranian Presidency Office via AP)

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