December 23, 2018: Mattis resigns, Trump disengages

Defense Secretary Mattis resigns after a struggle over Syria. Richard Haass & Fareed break down the President's drive to withdraw U.S. troops from Syria and decrease troop levels in Afghanistan. Then, do we focus too much on the negative? Or is the world really that scary? A debate between Niall Ferguson and Steven Pinker. Guests: Richard Haass, Niall Ferguson, Steven Pinker, Greta Thunberg 12/23/18

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