February 2, 2020: Sam Donaldson reacts to fast-tracked Senate trial; how impeachment reinforced two competing info-universes; news media's quick pivot to Iowa caucus coverage; how fear of Trump is hurting government agencies

Published: Feb. 2, 2020, 8:17 p.m.

Plus, why CNN nixed its plan for a final pre-Iowa poll; the State Department versus NPR; and David Zurawik on the 'mud wrestling pit' that is social media. Sam Donaldson, Julian Zelizer, Jill Filipovic, Alexi McCammond, Astead Herndon, Art Cullen and David Zurawik join Brian Stelter.