Sunday, December 1, 2019: Critical Days Ahead for Impeachment Inquiry

Impeachment enters a critical new phase, as Democrats claim they have the upper hand - and the president calls it a scam. Plus - Joe Biden's Iowa campaign shifts into high gear, with a message for his 2020 rivals: he's not going anywhere. And Elizabeth Warren's summer surge gives way to a winter reckoning. Nia-Malika Henderson in the anchor chair. Today's panel: Lisa Lerer of the New York Times, Axios' Margaret Talev, and the Washington Post's Seung Min Kim and Dan Balz. Plus CNN military and diplomatic analyst retired Rear Adm. John Kirby.

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