Sunday, October 20, 2019: Amid Mounting Republican Pushback, A Rare Retreat by Trump

The impeachment inquiry picks up steam, with a parade of key witnesses - and a stunning admission by the White House chief of staff. Plus, President Trump abandons a key ally in the Middle East and draws bipartisan storm - and cancels plans to host the G7 at his Florida resort after pushback from GOP allies. And Bernie Sanders draws a crowd in New York - and scores a big progressive endorsement. Today's Panel: CNN's Kaitlan Collins, Michael Shear of the New York Times, Karoun Demirjian of the Washington Post, and Politico's Laura Barrón-López.

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