What does Flake’s warning about Trump mean for the GOP?

A Twitter battle and a retirement announcement forced a Republican divide further into the public eye on Tuesday. Judy Woodruff gets two views from Brian McGuire, former chief staff for Majority Leader Mitch McConnell, and Chris Buskirk of American Greatness about the Senate departure of Sen. Jeff Flake, whether there’s a deeper party unity over the prospect of passing tax reform and more.