Kay Bailey Hutchison, U.S. Ambassador to NATO, joins Christiane Amanpour to discuss the key developments and dramas to come out of the NATO summit in London. Michael Lewis, author of "Fifth Risk" and "The Big Short," digs down into the political crisis unfolding on Capitol Hill, as the House Judiciary Committee hears its fist testimony from four constitutional scholars. He gives his take on the impeachment process so far and the future of the country. Our Hari Sreenivasan sits down with Jonathan Haidt, the social psychologist and co-author of "The Dark Psychology of Social Networks." He serves up solutions for what he calls the "outrage machine," that is spreading anger and toxicity.

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