Rosenberg: The cure for 'hearsay evidence' is to allow testimony and documents - will GOP do that?

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Legal analyst Chuck Rosenberg says Republicans have repeatedly complained about "hearsay evidence." Now that Sen. Chuck Schumer has introduced an amendment to subpoena Mick Mulvaney, who would have direct knowledge of Pres. Trump's actions on Ukraine, Rosenberg asks if they'll maintain that line of reasoning.