Sunday, January 12, 2020: Trump Faces a Credibility Gap on Iran

After a bold U.S. strike, Iran backs down. President Trump sees a major victory - but finds himself facing a crisis of credibility over his constantly-shifting justification for it. Meanwhile, Iranians take to the streets en masse to protest their government's accidental shootdown of a Ukrainian airliner. Plus, the impeachment trial approaches, as Nancy Pelosi signals she's ready to name managers and submit the articles to the Senate. And three weeks from the first votes, Iowa is a tossup. Today's panel: Julie Pace of the Associated Press, CNN's Jeff Zeleny, Karoun Demirjian of the Washington Post, and Vivian Salama of the Wall Street Journal

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