** FILE ** President Obama shakes hands with then-Deputy National Security Adviser Denis McDonough in the East Room of the White House in Washington, where on Jan. 25, 2013, he announced he will name Mr. McDonough as his next chief of staff. (Associated Press)

** FILE ** President Obama shakes hands with then-Deputy National Security Adviser Denis McDonough in the East Room of the White House in Washington, where on Jan. 25, 2013, he announced he will name Mr. McDonough as his next chief of staff. (Associated Press)