Acting-DNI Joseph Maguire defies law to hold whistleblower report

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Rachel Maddow reports on the existence of a whistleblower in the intelligence community, brought to light by Rep. Adam Schiff. The whistleblower was deemed credible and urgent by the inspector general, and the House Intelligence committee, by law, should receive the report. Instead acting-DNI Joseph Maguire is making excuses to withhold it.