Escalation: Impeachment probe launches with new subpoena to Sec. Pompeo

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Democrats subpoena Secretary of State Mike Pompeo for documents on Trump’s Ukraine call and Rudy Giuliani’s outreach in one of their first formal actions in the newly-launched impeachment probe. Juanita Tolliver, Leah Wright Rigueur and Kenji Yoshino join MSNBC Chief Legal Correspondent Ari Melber to discuss the Democrats’ strategy, and Rudy Giuliani’s many shifting stories.