Once again, two republican leading candidates – Cruz and Trump clash in a debate. Less than three weeks before the first primary votes are cast, GOP rivals Donald Trump and Ted Cruz are fighting for the lead in Iowa. “Face the Nation” moderator and CBS News political director John Dickerson joins “CBS This Morning” to discuss Thursday night’s GOP debate and the 2016 race.

The first time in the debate, Donald Trump was booed, but he turned it around smoothly, donald-trump style.