Iranian bioengineering researcher Nima Enayati walks out of a gate after arriving at John F. Kennedy International Airport in New York, Sunday, Feb. 5, 2017. The Ph.D. candidate at a university in Milan, was prevented from boarding a flight to the U.S. on Jan. 30. He had a visa to conduct research on robotic surgery at Stanford University in California. (AP Photo/Alexander F. Yuan)
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