Sunday, September 22, 2019: New Poll Shows a Shifting 2020 Race in Iowa

As 2020 Democrats flock to Iowa, a new CNN poll highlights a surge for Elizabeth Warren - and struggles for many of her competitors. Plus, President Trump asks for foreign election help - pressuring Ukraine to investigate Joe Biden and his family. Democrats cry foul, but Trump says what he did was "totally appropriate." And more troops head to the Middle East, as Washington and Tehran talk tough. Today's panel: the AP's Julie Pace, Michael Bender of the Wall Street Journal, Bloomberg's Sahil Kapur, and Seung Min Kim with the Washington Post.

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