President Barack Obama tapped Denis McDonough, one of his top foreign policy advisers and a long-time aide, as his new chief of staff on Friday. McDonough, who has worked with Obama closely for nearly a decade, will replace Jack Lew, whom Obama has picked as his new Treasury Secretary. "He's the consummate public servant who plays it straight," Obama said of McDonough. "And that's the kind of teamwork that I want in the White House." McDonough will be the fifth person to hold the job of chief of staff in Obama's administration. Before Lew was Bill Daley, who took over from Rahm Emanuel when Emanuel left to run for Chicago mayor. In between their tenures, Pete Rouse was briefly acting chief of staff. Obama also promoted White House communications director Dan Pfeiffer to a senior adviser role.