National Security Adviser Tom Donilon will resign and be replaced by Susan Rice,
the U.S. ambassador to the United Nations, White House officials said.
President Obama is expected to announce the major shakeup in his foreign policy team Wednesday, The New York Times reported.
Rice, 48, has been a magnet for Republican criticism for presenting an erroneous account of the attacks on the U.S. Consulate in Benghazi, Libya, in which Ambassador Christopher Stevens and three other diplomatic staffers were killed.
The post of national security adviser does not require Senate confirmation.
Obama also planned to nominate a new U.S. ambassador to the United Nations Wednesday, but the nominee's name was not disclosed, the Times said.
Donilon, 58, exerted influence on issues such as counter-terrorism, the refocus of America to Asia and the wars in Afghanistan and Iraq.
However, an uncomplimentary profile published recently in Foreign Policy magazine portrayed him as an infighter and a domineering boss with strained relationships with colleagues, including former NSA deputy Denis R. McDonough, now the White House chief of staff. Donilon and McDonough have denied the reports.
The Times reported Donilon said he had planned to leave after Obama's first term but remained at the president's request to assist with the new team led by Secretary of State John Kerry, Defense Secretary Chuck Hagel and CIA chief John Brennan.
Donilon's departure is effective in July.
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