Close Up: Former Vice President Mike Pence officially enters race for president

This week on "Close Up," former Vice President Mike Pence officially enters the presidential race. Hear why he says neither Joe Biden nor Donald Trump should be president again.North Dakota Gov. Doug Burgum is also getting into the presidential race. Hear why he says his small-state background makes him the ideal candidate.Meanwhile, former New Jersey Gov. Chris Christie is the third Republican to enter the race last week. Hear why he says he has no choice but to take Trump head-on.