Will this "hand grenade" inadvertently take down Trump?

The testimony is crystal clear. Trump's Russia adviser was "shocked" by the phone call at the center of the controversy. His Ukraine expert said there was "no ambiguity" about the quid pro quo. Attention now shifts to Mick Mulvaney and Rudy Giuliani, who are both implicated at the center of it all. Meanwhile, Trump tries to distance himself from another damning witness. CNN political director David Chalian dives into the week's final set of transcripts with CNN political correspondent Abby Philip. Plus, Pulitzer Prize winner Mark Mazzetti, a New York Times investigative correspondent and a CNN contributor, provides revelatory details about Giuliani's "shadow foreign policy."