President Obama is leaning toward choosing Denis McDonoughDenis McDonoughThe Hill's 12:30 Report Obama, Trump display unity in White House meeting Dark days for Obama’s White House 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 BidenSenate names part of Cures bill after Beau Biden Overnight Finance: Trump adviser softens tone on NAFTA | Funding bill to be released Tuesday | GOP leader won't back Trump tariff plan Cures bill clears first Senate hurdle MORE.

Obama is looking for a successor to current White House Chief of Staff Jack LewJack LewOvernight Finance: House GOP plans short-term spending bill | Senate Republicans not happy | Yellen intends to finish term Lew: Don't paint Wall Street execs with 'broad brushstroke' Dumping Obama’s faux foreign tax legislation should be high on Trump's to-do list 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.