WASHINGTON, DC – JUNE 05: U.S. President Barack Obama speaks as former aide Samantha Power (L), U.S. Ambassador to the United Nations Susan Rice (R) and incumbent National Security Adviser Tom Donilon (2L) listen during a personnel announcement at the Rose Garden of the White House June 5, 2013 in Washington, DC. President Obama has nominated Rice to succeed Donilon to become the next National Security Adviser. Obama has also nominated Power to succeed Rice for her position to the UN. (Photo by Alex Wong/Getty Images)