President Obama is leaning toward choosing Denis McDonoughDenis McDonoughTrump administration must release Clinton emails State Department tried to hide Sunday shows preview: McMaster hits circuit for second straight week Obama chief of staff: 'The president cannot order a wiretap' 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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Another leading candidate is Ron Klain, former chief of staff to Vice President Joe BidenJoe BidenAmazon primed for merger battle Delaware pool where Biden worked as lifeguard named after him The Hill's 12:30 Report MORE.

Obama is looking for a successor to current White House Chief of Staff Jack LewJack LewEU slaps Google with record .7B antitrust fine for skewing search results White House divide may derail needed China trade reform 3 unconventional ways Trump can tackle the national debt MORE, the president's pick to be the next Treasury secretary.

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.