Will GOP hold Waltz accountable? Trump's UN pick questioned after Signal controversy

Let's bring in NBC News senior national politics reporter John Allen, chief Capitol Hill correspondent Ryan Nobles, and former Democratic Senator John Tester of Montana. He's an MSNBC political analyst. And let's start with the very latest on the Hill.Ryan, Senator Cory Booker of New Jersey just slammed Republicans for their alleged lack of investigation into that signal gate matter. Let's listen. This is the party that had dozens and dozens of hearings about Hillary Clinton's emails.This is the party that ...