** FILE ** In this Jan. 7, 2013, file photo, President Barack Obama shakes hands with Defense Secretary-nominee, former Nebraska Sen. Chuck Hagel, in the East Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais. File)

Photo by: Pablo Martinez Monsivais

** FILE ** In this Jan. 7, 2013, file photo, President Barack Obama shakes hands with Defense Secretary-nominee, former Nebraska Sen. Chuck Hagel, in the East Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais. File)