The once historically diverse Democratic field shrinks again: Senator Cory booker suspends his presidential campaign.

With three weeks to go before the Iowa caucuses, the attacks get sharper as six of the the leading Democrats prepare for tomorrow's CNN debate.

And the defense secretary concedes he never saw intelligence specifically indicating an Iranian threat on four American embassies, despite what President Trump said.

Today's panel: Seung Min Kim with The Washington Post, Sirius XM's Olivier Knox, Tarini Parti with The Wall Street Journal, and CNN's Kaitlan Collins.

Also on the show: CNN's Jeff Zeleny, Nic Robertson, Max Foster, and Victoria ArbiterTo learn more about how CNN protects listener privacy, visit cnn.com/privacy

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