Broadcasting from Concord, New Hampshire, Morning Joe’s Mike Barnicle breaks down the developing feud between Republican presidential candidates New Jersey Gov. Chris Christie and Donald Trump. “We’re sitting in a state that’s going to be ground zero for that mano-a-mano combat—Trump vs. Christie. Christie is getting increasing strength in New Hampshire and the New Hampshire Union Leader endorsement is very big for him because it’s an endorsement that comes each and every day,” says Mike of Gov. Christie’s chances in New Hampshire. Watch the conversation and clips of the latest back and forth between Trump and Christie here. Only on MSNBC.