Rubio 'can't be in two places at the same time': David Sanger on major WH shakeup

President Donald Trump announced today that he’s nominating Mike Waltz to serve as UN ambassador, shifting from his role as national security adviser. Secretary of State Marco Rubio will replace Waltz in the prior role on an interim basis. CNN's Kasie Hunt leads a panel discussion on the recent major staff shakeup. #CNN #News