President Barack Obama talks with senior advisors in the Oval Office, May 1, 2013. Pictured, from left, are: Chief of Staff Denis McDonough; Mark Childress, Deputy Chief of Staff for Planning; and David Simas, Deputy Senior Advisor for Communications and Strategy.

President Barack Obama talks with senior advisors in the Oval Office, May 1, 2013. Pictured, from left, are: Chief of Staff Denis McDonough; Mark Childress, Deputy Chief of Staff for Planning; and David Simas, Deputy Senior Advisor for Communications and Strategy.

Vice President Joe Biden talks with Lisa Monaco, Assistant to the President for Homeland Security and Counterterrorism, in the Rose Garden of the White House, May 1, 2013.

Vice President Joe Biden talks with Lisa Monaco, Assistant to the President for Homeland Security and Counterterrorism, in the Rose Garden of the White House, May 1, 2013.