Tuesday, January 14, 2020: Sanders-Warren Feud Escalates Before Tonight's CNN Debate

It is debate night for the six leading 2020 Democrats. There are new tensions between progressives Elizabeth Warren and Bernie Sanders, while Joe Biden, Pete Buttigieg and Amy Klobuchar look to sell Iowa caucus voters on the idea a centrist has the best chance to beat President Trump. House Speaker Nancy Pelosi tells House Democrats they have to wait one more day to find out who she will tap to manage the Senate impeachment trial. And Majority Leader Mitch McConnell waits for the impeachment articles to arrive in the Senate, and watches a handful of Republicans who might vote to include witnesses in the trial. On today's panel: Julie Pace with Associated Press, CNN's MJ Lee, Sahil Kapur with Bloomberg, Jackie Kucinich with The Daily Beast, and Paul Kane with The Washington Post Also, on the program: Alex Thompson with POLITICO and CNN's Arlette Saenz, Manu Raju, and Lauren Fox

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