Monday, September 23, 2019: "Tipping Point" on Impeachment

President Trump is at the UN where he was greeted by questions about his controversial summer call with the leader of Ukraine. Plus, House Democrats say they're reaching a tipping point on impeachment. President Trump says he's not worried. And new polls show a surge for Elizabeth Warren in Iowa. Today's Panel: CNN's Nia-Malika Henderson, Michael Shear with The New York Times, Rachael Bade with The Washington Post, and Alex Thompson with POLITICO. Also on the Program: CNN's Kaitlan Collins and Diplomatic And Military Analyst, Retired Rear Admiral John Kirby.

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