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The Mueller investigation and the recent indictments have suggested the Russians tried promote discord and divide our country political before, during and after the 2016 election.

But most sane people know: we didn't need Russians to divide us. Like all humans, Americans are naturally divided...

On Tuesday's show, Amy Chua, who many know as "Tiger Mom" joined Tom to discuss her new book, "POLITICAL TRIBES: Group Instinct and the Fate of Nations" where she discusses tribalism and how and why Americans have been divided ...