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Army officer who heard Trump's Ukraine call voiced his concerns to superiors


Lt. Col. Alexander Vindman plans to tell House impeachment investigators that he heard Trump appeal to Ukraine's president to investigate one of his leading political rivals, a request the aide considered so damaging to American interests that he reported it to a superior. Lawrence O’Donnell discusses with Josh Lederman, Michael McFaul, Evelyn Farkas, and Jonathan Alter.