U.S. President <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Barack+Obama&family=editorial&specificpeople=203260 ng-click='$event.stopPropagation()'>Barack Obama</a> speaks at an event announcing the nominations of Sylvia Mathews Burwell, the President of the Walmart Foundation, as his budget chief, Gina McCarthy, to head the Environmental Protection Agency and MIT professor Ernest Moniz as Energy Secretary, during a ceremony in the East Room of the White House March 4, 2013 in Washington, DC. The nominations will be key appointments for Obama's second term while focusing on the issues of the national budget as well as energy and climate issues.