President Obama smiles during a joint news conference with Singapore's Prime Minister Lee Hsien Loong at the White House Tuesday in Washington, D.C. Chip Somodevilla/Getty Images hide caption

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President Obama and Hillary Clinton stand together on stage on the third day of the Democratic National Convention in Philadelphia. Justin Sullivan/Getty Images hide caption

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President Obama makes a statement at the White House about the deadly shooting of police officers in Baton Rouge, La., on Sunday. A day later, he sent an open letter to the nation's law enforcement officers expressing his condolences and support. Yuri Gripas/AFP/Getty Images hide caption

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Speaking at the White House, President Obama called for unity after the killing of police officers in Baton Rouge, La. on Sunday. Yuri Gripas/AFP/Getty Images hide caption

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Barack Obama accepts the Democratic presidential nomination at the 2008 Democratic National Convention on Aug. 28, 2008, in Denver. Chuck Kennedy/AFP/Getty Images hide caption

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Listen to NPR Special Coverage: Obama's Years

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President Obama is interviewed by Steve Inskeep at the White House on Monday. Ariel Zambelich/NPR hide caption

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Listen to NPR Special Coverage: Obama's Years

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President Obama is interviewed by NPR's Steve Inskeep. Ariel Zambelich/NPR hide caption

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Obama: Trump Hasn't Captured 'Zeitgeist Of The Country'

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President Obama is interviewed by NPR's Steve Inskeep at the White House on Monday. Mito Habe-Evans/NPR hide caption

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Obama Cautions Against 'Hysteria' Over Brexit Vote

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West Virginia State Trooper C.S. Hartman walks from a shed that he checked out as he and other crews search homes on Saturday in Rainelle, W.Va. Steve Helber/AP hide caption

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Demonstrators gather in a silent rally to mourn the death of an Okinawa woman in front of Camp Zukeran on May 22. The crime is thrusting the opposition to the U.S. presence on Okinawa back in the spotlight. The Asahi Shimbun/The Asahi Shimbun via Getty Images hide caption

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As President Visits Japan, Okinawa Controversy Is Back In The Limelight

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