Barack Obama

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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)

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President Barack Obama speaks in the Oval Office of the White House in Washington, Thursday, April 30, 2015, before signing bill S. 535 Energy Efficiency Improvement Act of 2015. (AP Photo/Pablo Martinez Monsivais) ** FILE **

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President Barack Obama speaks in the Oval Office of the White House in Washington, Thursday, April 30, 2015, before signing bill S. 535 Energy Efficiency Improvement Act of 2015. (AP Photo/Pablo Martinez Monsivais) **FILE**

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President Barack Obama walks to the presidential limousines after stepping off Marine One at Walter Reed National Military Medical Center in Bethesda, Md., Wednesday, April 29, 2015, for a visit with wounded military personnel. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama rides in the presidential limousines at Walter Reed National Military Medical Center in Bethesda, Md., Wednesday, April 29, 2015, for a visit with wounded military personnel. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama takes a walk along Pennsylvania Avenue in Washington, Wednesday, April 29, 2015, with 2015 National Teacher of the Year Shanna Peeples of Amarillo, Texas, following an event to honor the 2015 National Teacher of the Year and finalists in the Rose Garden. (AP Photo/Susan Walsh)

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President Barack Obama presents an award to the National Teacher of the Year Shanna Peeples of Amarillo, Texas during an event to honor the teachers of the year, Wednesday, April 29, 2015, in the Rose Garden of the White House in Washington. (AP Photo/Evan Vucci)

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President Barack Obama raise a cup of sake as he offers a toast as he and first lady Michelle Obama host Japanese Prime Minister Shinzo Abe and his wife Akie Abe at the State Dinner at the White House in Washington, Tuesday, April 28, 2015. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama raise a cup of sake as he offers a toast as he and first lady Michelle Obama host Japanese Prime Minister Shinzo Abe and his wife Akie Abe at the State Dinner at the White House in Washington, Tuesday, April 28, 2015. (AP Photo/Pablo Martinez Monsivais)

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Japanese Prime Minister Shinzo Abe listens as President Barack Obama speaks during their joint news conference in the Rose Garden of the White House in Washington, Tuesday, April 28, 2015. (AP Photo/Andrew Harnik)

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President Barack Obama speaks during a news conference with Japanese Prime Minister Shinzo Abe, Tuesday, April 28, 2015, in the Rose Garden of the White House in Washington. (AP Photo/Susan Walsh)

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Secretary of State John Kerry, sitting next to National Security Adviser Susan Rice, yawns during a joint news conference between President Barack Obama and Japanese Prime Minister Shinzo Abe , Tuesday, April 28, 2015,in the Rose Garden of the White House in Washington. (AP Photo/Susan Walsh)