Barack Obama

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President Barack Obama speaks at a Democratic fundraiser at Sentinel Hotel, Thursday, May 7, 2015, in Portland, Ore. On Friday, the president will visit Nike headquarters in Beaverton, Ore. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama, right, is greeted by Oregon Gov. Kate Brown, left, on the tarmac during his arrival on Air Force One, Thursday, May 7, 2015, at Oregon Air National Guard Base in Portland, Ore. On Friday, the president will visit Nike headquarters in Beaverton, Oregon, to make his trade policy pitch as he struggles to win over Democrats for what could be the last major legislative push of his presidency. But in choosing the giant sneaker and athletic wear company as his backdrop, Obama has stirred a hornet's nest. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama meets with Gen. Joseph F. Dunford, Jr. and Gen. Martin Dempsey, Chairman of the Joint Chiefs of Staff, left, in the Oval Office, Sept. 30, 2014. (Official White House Photo by Pete Souza)

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President Barack Obama waves goodbye as he boards Air Force One for departure from RAF Station Fairford in Gloucestershire, England, en route to Joint Base Andrews, Md., Sept. 5, 2014. (Official White House Photo by Pete Souza)

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President Barack Obama talks with British Prime Minister David Cameron following their joint press conference at Lancaster House in London, England, May 25, 2011. (Official White House Photo by Pete Souza)

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The Obama administration is quietly negotiating weapons deals with the Saudia Arabian kingdom, which is wary of a deal between the U.S. and Iran over nuclear weapons. (Associated Press)

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President Barack Obama greets people in the audience after speaking during a Cinco de Mayo reception in the East Room of the White House in Washington, Tuesday, May 5, 2015. Obama says that when it comes to achieving a comprehensive overhaul of immigration laws progress is 'not always a straight line.' He says that despite his executive actions on immigration, Congress still needs to pass legislation to make more permanent changes. (AP Photo/Carolyn Kaster)

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After Gen. Martin Dempsey stepped down as chairman of the Joint Chiefs of Staff, the Obama administration all but removed land mines from the U.S. arsenal. (Associated Press/File)

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Marine Gen. Joseph Dunford, Jr. listens as President Barack Obama announces that he will nominate Dunford as the next chairman of the Joint Chiefs of Staff, Tuesday, May 5, 2015, in the Rose Garden of the White House in Washington. Obama chose the widely respected, combat-hardened commander who led the Afghanistan war coalition during a key transitional period during 2013-2014 to succeed Army Gen. Martin Dempsey. (AP Photo/Jacquelyn Martin)

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In this image released by CBS, President Barack Obama, left, appears with host David Letterman during a taping of "Late Show with David Letterman," on Monday, May 4, 2015, in New York. (John Filo/CBS via AP)

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President Barack Obama nominated Marine Gen. Joseph Dunford Jr. as the next chairman of the Joint Chiefs of Staff, choosing a widely respected, combat-hardened commander who led the Afghanistan war coalition during a key transition in 2013-2014. (Associated Press)

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President Barack Obama speaks at the launch of My Brother's Keeper Alliance at Lehman College in the Bronx borough of New York, Monday, May 4, 2015. My Brother's Keeper Alliance is an outgrowth of Obama's year-old My Brother's Keeper initiative, which has focused on federal government policies and grants designed to increase access to education and jobs. (Susan Watts/The Daily News via AP, Pool)

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President Barack Obama gestures as he speaks at Lehman College in the Bronx borough of New York, Monday, May 4, 2015. Obama announced the creation of an independent nonprofit organization that is a spin off his "My Brother's Keeper" program, which works to give young men of color more opportunities through mentoring and business partnerships. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama waves from the doorway of Air Force One at Andrews Air Force Base, Md., Monday, May 4, 2015. Obama is flying to New York City. (AP Photo/Cliff Owen)

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In this May 1, 2015 photo, President Barack Obama speaks in the Roosevelt Room of the White House in Washington, Friday, May 1, 2015. Piece by piece, President Barack Obama is building the foundation for the legacy he wants to leave, putting in place decisions that will reverberate beyond his presidency. (AP Photo/Susan Walsh)

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President Barack Obama speaks at Anacostia Library in Washington, Thursday, April 30, 2015, as he participates in a live "virtual field trip" with middle school students to announce two initiatives to improve education through digital connectivity. (AP Photo/Susan Walsh)

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President Barack Obama smiles as he speaks at Anacostia Library in Washington, Thursday, April 30, 2015, as he participates in a live "virtual field trip" with middle school students to announce two initiatives to improve education through digital connectivity. The president announced Thursday that major book publishers will provide more than $250 million in free e-books to low-income students and that he is seeking commitments from local governments and schools nationwide to provide library cards to all students. (AP Photo/Susan Walsh)