FILE - In this April 6, 2016, file photo, Iranian students prepare their robots during the international robotics competition, RoboCup Iran Open 2016, in Tehran, Iran. Universities in the U.S. say President Donald Trump's revised travel ban would block hundreds of graduate students who play key roles in research. Twenty-five of America's largest universities told The Associated Press they've sent acceptance letters to more than 500 students from the six banned countries for next fall, mostly from Iran, who are known for their strength in engineering and sciences. (AP Photo/Vahid Salemi)
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