Trump: ‘Turned out to be a nothing call’ with Ukraine

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Now that House Speaker Nancy Pelosi has announced a formal impeachment inquiry, Ali Velshi is joined by NBC’s Peter Alexander, former federal prosecutor Cynthia Alksne, and New York Times White House Correspondent Annie Karni to discuss the impeachment process and the legal details of this case. Weighing in: historian and author of “The Impeachers,” Brenda Wineapple.