Christopher Ruddy, CEO of Newsmax Media, joins Christiane Amanpour to discuss the White House barring a key witness from testifying in the impeachment injury. Danylo Lubkivsky, former Ukrainian Deputy Foreign Minister, weighs in on Ukraine's part in the current U.S. political crisis. Peter Galbraith, former U.S. Ambassador, explains the dangers of President Trump's decision to remove U.S. troops from Northern Syria. Our Hari Sreenivasan sits down with Christopher Wylie, former Cambridge Analytica Employee and whistleblower, to discuss his new book that reflects on the Facebook data mining scandal he exposed in 2018.To learn more about how CNN protects listener privacy, visit cnn.com/privacyLearn more about your ad choices. Visit podcastchoices.com/adchoices