The Big Question: Why is this whistleblower being silenced?

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Lawmakers did not find out the substance of a whistleblower's complaint about a communication the President had with a foreign leader. Today’s Big Question: Why is this whistleblower being silenced? NBC's Ken Dilanian, Third Way Vice President and Former House Intel Committee Staffer Mieke Eoyang, and Brookings Senior Fellow Ben Wittes joins Katy Tur to discuss.