FBI Director James Comey has asked the Department of Justice to publicly refute claims by President Trump that then-President Barack Obama conducted electronic surveillance on Trump Tower in New York City last year. Susan Walsh/AP hide caption

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Susan Walsh/AP

Cuban refugees float in heavy seas 60 miles south of Key West, Fla., in 1994. The Obama administration is ending a two-decades-old policy of allowing Cuban refugees to stay in the U.S. if they can make it to U.S. soil. Dave Martin/AP hide caption

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Dave Martin/AP

President Barack Obama and German Chancellor Angela stressed the importance of working toward political and economic unity Thursday, during a news conference at the Chancellery in Berlin. Carsten Koall/Getty Images hide caption

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Carsten Koall/Getty Images

Philippine President Rodrigo Duterte arrives Monday in Vientiane, Laos, for the ASEAN Summit. The U.S. canceled a bilateral meeting scheduled for Dutarte and President Obama. Noel Celis/AFP/Getty Images hide caption

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Noel Celis/AFP/Getty Images

A kayaker paddles along Zephyr Cove, near the site of the 20th Annual Lake Tahoe Summit in south Lake Tahoe, Nev. President Obama said the environmental challenges of conservation and fighting climate change are inseparably linked. Rich Pedroncelli/AP hide caption

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Rich Pedroncelli/AP

U.S. President Barack Obama addresses a press conference during the second day of the NATO Summit at the Polish National Stadium in Warsaw on Saturday. Mandel Ngan/AFP/Getty Images hide caption

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Mandel Ngan/AFP/Getty Images

President Obama took on his critics Tuesday, saying of the "radical Islam" term, "What exactly would using this label accomplish? What exactly would it change? Would it make ISIS less committed to trying to kill Americans? Would it bring in more allies?" Saul Loeb/AFP/Getty Images hide caption

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Saul Loeb/AFP/Getty Images

President Obama arrives at the podium to address the Cuban people at the National Theater in Havana on Tuesday. He said the two countries should let go of the past and benefit from better relations in the future. Desmond Boylan/AP hide caption

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Desmond Boylan/AP

Cuban President Raúl Castro lifts up President Obama's arm at the conclusion of Monday's joint news conference at the Palace of the Revolution in Havana. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP