President Obama is expected to name Susan Rice as his new national security adviser later on Wednesday, according to several published reports.
Rice, who is currently the ambassador to the United Nations, would replace Tom Donilon in the post.
Rice had been President Obama's choice to replace Hilary Clinton as secretary of state, but that plan was nixed when Rice became a target of withering Republican opposition amid controversy over the Sept. 11, 2012, attack in Benghazi, Libya.
Massachusetts Sen. and former presidential candidate John Kerry was eventually named secretary of state.
If she is appointed to serve as national security adviser, Rice will not require Senate confirmation.