President Obama is leaning toward choosing Denis McDonoughDenis McDonoughSunday shows preview: McMaster hits circuit for second straight week Obama chief of staff: 'The president cannot order a wiretap' Obama's chief of staff joins foundation with focus on jobs 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 BidenTrump’s wall jams GOP in shutdown talks Bipartisan friendship is a civil solution to political dysfunction Warren builds her brand with 2020 down the road MORE.

Obama is looking for a successor to current White House Chief of Staff Jack LewJack LewWhite House divide may derail needed China trade reform 3 unconventional ways Trump can tackle the national debt One year later, the Iran nuclear deal is a success by any measure 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.