January 12, 2020: Twitter war turns into Twitter diplomacy; Bill Weld's view of campaign coverage; Harry and Meghan versus the British tabloids

Plus, a thought experiment by James Fallows; Nicholas Kristof and Sheryl WuDunn on their new book "Tightrope;" and the biggest change about campaign coverage in 2020. James Fallows, John Kirby, Hadas Gold, Bill Weld, Nicholas Kristof, Sheryl WuDunn and Sally Buzbee join Brian Stelter.

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