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Key impeachment 'drug deal' witness willing to defy Trump


Star witness John Bolton, Trump’s former National Security Advisor, is preparing to potentially testify against Trump in House Dems’ impeachment probe. Bolton is a key witness, with high ranking credentials, who reportedly had a devastating objection to the Ukraine plot in real time, calling it a ‘drug deal.’ Experts join Ari Melber to discuss breaking news developments and the latest in the impeachment probe.