Members of the Secret Service follow President Obama as he arrives at Northwestern University in Evanston, Ill., in 2014. Brendan Smialowski/AFP/Getty Images hide caption

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President Obama meets with (from left) Oregon National Guardsman Alek Skarlatos, Anthony Sadler and Air Force Airman 1st Class Spencer Stone on Thursday in the Oval Office of the White House. Andrew Harnik/AP hide caption

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An unmanned drone patrols the U.S.-Canadian border. Attorney General Eric Holder, in a letter to Sen. Rand Paul, R-Ky., said the president could in an "extraordinary circumstance" order a drone strike inside the country. U.S. Customs and Border Protection /AP hide caption

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