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

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.To learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices