President Obama speaks during a joint news conference with British Prime Minister David Cameron on May 13, 2013, in the East Room of the White House. (Associated Press)
White House spokesman Jay Carney speaks during his daily news briefing at the White House in Washington on May 15, 2013. (Associated Press)
White House spokesman Jay Carney speaks during his daily news briefing at the White House in Washington on May 15, 2013. (Associated Press)
**FILE** President Obama speaks April 19, 2013, in the Brady Press Briefing at the White House in Washington about the Boston Marathon bombing and the explosions in West, Texas. (Associated Press)
President Obama answers questions during his new conference in the Brady Press Briefing Room of the White House in Washington on April 30, 2013. (Associated Press)
President Obama answers questions during his new conference in the Brady Press Briefing Room of the White House in Washington on April 30, 2013. (Associated Press)
President Obama gestures during a joint news conference with British Prime Minister David Cameron on Monday, May 13, 2013, in the East Room of the White House in Washington, where they talked about subjects ranging from Syria's civil war to preparations for a coming summit in Northern Ireland. (AP Photo/J. Scott Applewhite)
White House spokesman Jay Carney listens to a question during his daily news briefing at the White House in Washington on May 15, 2013. (Associated Press)
White House spokesman Jay Carney listens to a question during his daily news briefing at the White House in Washington on May 15, 2013. (Associated Press)
