New witnesses called to testify before impeachment committees

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John Eisenberg, the White House lawyer at the center of the Trump-Ukraine scandal, has been subpoenaed to appear before the impeachment investigation. Energy Secretary Rick Perry has been requested to appear, but he refuses to take part in a closed door hearing. How will the committee handle these potential witnesses? Ali Velshi discusses with Rep. Ro Khanna, Barbara McQuade, and Ben Rhodes.