President Barack Obama on Wednesday formally announced Susan Rice's appointment as National Security Advisor to succeed Tom Donilon, who is stepping down.
"I'm absolutely thrilled that she'll be back at my side leading my national security team in my second term," Obama said of Rice.
In the press conference at the White House Rose Garden, he described the ambassador as "fearless" and a "consummate public servant."
Rice thanked the president, saying "I am deeply grateful for your enduring confidence in me."
Obama also announced his intention to nominate Samantha Power, who he called "a relentless advocate for American interests and values," to replace Rice as U.S. Ambassador to the United Nations.
"I strongly urge the U.S. Senate to confirm her without delay," he said.