President Obama is leaning toward choosing Denis McDonoughDenis McDonoughTrump mocked Obama for three chiefs of staff in three years Former Obama UN ambassador to meet with Senate Intelligence panel: report Trump administration must release Clinton emails State Department tried to hide MORE, currently a deputy national security adviser, as his next chief of staff, sources told Bloomberg.

McDonough, who worked on Obama's 2008 campaign, is considered deeply loyal to the president. He was a longtime congressional aide who worked for Obama when he was a freshman senator. McDonough also served as foreign policy adviser to then-Senate Democratic Leader Tom Daschle (S.D.) and legislative director to then-Sen. Ken Salazar (D-Colo.), who is now the secretary of the Interior.

He also worked as a senior fellow at the Center for American Progress, a liberal think tank, and joined the National Security Council in 2009.

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McDonough graduated from St. John's University in Collegeville, Minn., where he played football, and has a master's degree in foreign affairs from Georgetown University. The 6-foot-3 McDonough often plays basketball with the president and, Bloomberg notes, he usually rode his bike from his home in Tacoma Park, Md., to work until a recent accident.

He would be Obama's fifth chief of staff.