Harvard University

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Former U.S. Deputy Attorney General Sally Yates delivers an address at Harvard Law School Class Day 2017 on Wednesday, May 24, 2017, at Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne)

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Former U.S. Deputy Attorney General Sally Yates delivers an address at Harvard Law School Class Day 2017 on Wednesday, May 24, 2017, at Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne)

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Former U.S. Deputy Attorney General Sally Yates delivers an address at Harvard Law School Class Day 2017 on Wednesday, May 24, 2017, at Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne)

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Former U.S. Deputy Attorney General Sally Yates delivers an address at Harvard Law School Class Day 2017 on Wednesday, May 24, 2017, at Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne)

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Former Vice President Joe Biden delivers the annual Harvard College Class Day address, Wednesday, May 24, 2017, on the campus of Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne)

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Former Vice President Joe Biden delivers the annual Harvard College Class Day address, Wednesday, May 24, 2017, on the campus of Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne)

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Former Vice President Joe Biden delivers the annual Harvard College Class Day address, Wednesday, May 24, 2017, on the campus of Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne)

Former Vice President Joe Biden delivers the annual Harvard College Class Day address, Wednesday, May 24, 2017, on the campus of Harvard University, in Cambridge, Mass. (AP Photo/Steven Senne) ** FILE **

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In this Dec. 1, 2015, file photo, then-Defense Secretary Ash Carter responds to a question during a forum at the John F. Kennedy School of Government at Harvard University in Cambridge, Mass. (AP Photo/Steven Senne, File)

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Singer Rihanna applauds during 2017 Harvard University Humanitarian of the Year Award ceremonies before being presented with the award at the school, Tuesday, Feb. 28, 2017, in Cambridge, Mass. (AP Photo/Steven Senne)

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Honoree Rihanna reacts during ceremonies for the 2017 Harvard University Humanitarian of the Year Award at Harvard University, Tuesday, Feb. 28, 2017, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna addresses an audience after being presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna holds flowers and waves as she steps off stage after she was presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna approaches a podium to be presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna, left, is presented with the 2017 Harvard University Humanitarian of the Year Award by Allen Counter, director of the Harvard Foundation, right, during ceremonies at the school, Tuesday, Feb. 28, 2017, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna addresses an audience after being presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna addresses an audience after being presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Actor Ryan Reynolds laughs during a roast at Harvard University in Cambridge, Mass., Friday, Feb. 3, 2017. Reynolds was honored as "Man of the Year" by the Hasty Pudding Theatricals at Harvard University. (AP Photo/Charles Krupa)

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Actor Ryan Reynolds waves as he is introduced during a roast at Harvard University in Cambridge, Mass., Friday, Feb. 3, 2017. Reynolds was honored as "Man of the Year" by the Hasty Pudding Theatricals at Harvard University. (AP Photo/Charles Krupa)

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Actor Ryan Reynolds performs squats with an actor on his back during a roast at Harvard University in Cambridge, Mass., Friday, Feb. 3, 2017. Reynolds was honored as "Man of the Year" by the Hasty Pudding Theatricals at Harvard University. (AP Photo/Charles Krupa)