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. Iran's President Hassan Rouhani is threatening the United States with a "harsh reaction", after Congress voted last week to renew sanctions against the country for an additional 10 years.