The White House is expected to announce the appointment of U.N. Ambassador Susan Rice as President Obama’s national security adviser for the rest of his second term. Rice will replace Tom Donilon, who is stepping down. She withdrew from consideration to become Secretary of State in December after Republicans accused her of misleading the public with comments she made on Sunday talk shows over last year’s killings of the U.S. ambassador and three other Americans in Benghazi, Libya.