Barack Obama

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President Barack Obama kissing author and poet Maya Angelou after awarding her the 2010 Medal of Freedom during a ceremony in the East Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais, File)

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President Obama plays with a football as he walks back to the Oval Office of the White House in Washington on May 21, 2009. (Associated Press) **FILE**

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President Barack Obama delivers the commencement address to the U.S. Military Academy at West Point's Class of 2014, in West Point, N.Y., Wednesday, May 28, 2014. In a broad defense of his foreign policy, the president declared that the U.S. remains the world's most indispensable nation, even after a "long season of war," but argued for restraint before embarking on more military adventures. (AP Photo/Susan Walsh)

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President Barack Obama watches cadets hats after they were thrown at the end of a graduation and commissioning ceremony at the U.S. Military Academy, Wednesday, May 28, 2014, in West Point, N.Y. (AP Photo/Mike Groll)

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President Barack Obama arrives to a graduation and commissioning ceremony at the U.S. Military Academy on Wednesday, May 28, 2014, in West Point, N.Y. In a broad defense of his foreign policy, the president declared that the U.S. remains the world's most indispensable nation, even after a "long season of war," but argued for restraint before embarking on more military adventures. (AP Photo/Mike Groll)

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FILE - This April 28, 2014 file photo shows demonstrators sitting on the sidewalk outside the White House in Washington during a demonstrations to demand President Barack Obama stop deportation of immigrants. Republicans standing between President Barack Obama and an immigration overhaul say the president’s move to ease deportations is Exhibit A for why Obama can’t be trusted to enforce the law. So Obama is moving to deny Republicans that argument, setting up the GOP to bear all the blame if summer comes and goes with no action on immigration.. (AP Photo, File)

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A 2010 Pentagon directive signed by then-Deputy Defense Secretary William J. Lynn details what critics say is a troubling policy that envisions the Obama administration's potential use of military force against Americans. (Associated press)

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President Barack Obama waves as he walks from the Marine One helicopter to the Oval Office of the White House, in Washington, Wednesday, May 28, 2014, as he returns from delivering the commencement address at the United States Military Academy at West Point, New York. (AP Photo/Carolyn Kaster)