Obama names Susan Rice National Security Adviser.
A White House official said that Tom Donilon is resigning as Obama's National Security Adviser and will be replaced by Rice.
Donilon's resignation marks a significant shakeup for Obama's national security team.
Senate Republicans had threatened to block Rice's nomination to the State Department--but the national security adviser's job does not require Senate confirmation.
Obama also plans to nominate former National Security Council aide Samantha Power to replace Rice as U.S. Ambassador to the United Nations.
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