Key diplomats set to testify on Ukraine as 2nd whistleblower emerges

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More subpoenas have been issued in the House impeachment inquiry, as a second whistleblower comes forward about President Trump’s call with the president of Ukraine. Stephanie Ruhle and Ali Velshi are joined by John Kostyack from the National Whistleblower Center to discuss what protections that whistleblower has as the impeachment inquiry ramps up.