Renowned political analyst Jeff Greenfield talks with Brian Stelter about the start of a formal impeachment inquiry against President Trump. He says "the kind of reflexive, circle the wagons, 'remember this is our guy'" strategy among Republicans and pro-Trump media outfits "may not fully survive this latest story." He describes the many differences between the Nixon and Clinton impeachments and the current proceedings, including a much more chaotic news environment. His advice for journalists covering the story: "Take a breath."

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