** FILE ** President Obama speaks about Ukraine, Monday, March 17, 2014, in the James Brady Press Briefing Room at the White House in Washington. (AP Photo/ Pablo Martinez Monsivais)
Sen. Rand Paul, Kentucky Republican, came out as the favored Republican candidate for a White House run in 2016 in a recent CNN/ORC poll, garnering 16 percent of the support. (Associated Press)
Irish Prime Minister Enda Kenny, left, and President Barack Obama, hold up a bowl of Irish shamrocks during a St. Patrick’s Day reception in the East Room of the White House in Washington, Friday, March 14, 2014. (AP Photo/Manuel Balce Ceneta)