President Obama is leaning toward choosing Denis McDonoughDenis McDonoughObama staffers challenged to WH scavenger hunt on final day Chief of staff: Obama administration 'historically free of scandal' Sunday shows preview: Trump allies appear after John Lewis criticism 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 BidenThe Women's March was about tantrums, not women Biden boards train home to Delaware after Trump's inauguration Overnight Tech: Meet the key players for Trump on tech | Patent chief staying on | Kerry aide goes to Snapchat | Uber's M settlement MORE.

Obama is looking for a successor to current White House Chief of Staff Jack LewJack LewOne year later, the Iran nuclear deal is a success by any measure Chinese President Xi says a trade war hurts the US and China Overnight Finance: Price puts stock trading law in spotlight | Lingering questions on Trump biz plan | Sanders, Education pick tangle over college costs 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.