Why Mattis and Trump might be an 'awkward fit'

Who is James “Mad Dog” Mattis, the president-elect’s choice for secretary of defense? Judy Woodruff sits down with two who know the retired general well: Michael Gordon of The New York Times and Steve Simon, a former national security council staffer in the Obama administration. They discuss why Mattis is an 'unconventional' option, the challenges he may face and his monk-like temperament.