WASHINGTON (Reuters) - President Barack Obama on Friday will name veteran foreign policy aide Denis McDonough as his next White House chief of staff, replacing Jack Lew, as part of an overhaul of his senior staff, a White House official said. Obama will announce the appointment of McDonough, who worked on Obama's 2008 presidential campaign and is now a deputy national security adviser, at 12:10 p.m. EST at the White House, the official said. McDonough had been widely tipped to succeed Lew after his nomination as Treasury secretary. ...