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Sen. Chris Van Hollen on GAO report: 'This is a bombshell'

05:47

Nonpartisan U.S. Government Accountability Office, the GAO, concluded that the Trump administration violated the law in withholding the aid to Ukraine. Democratic Senator Chris Van Hollen, who last month, called for the federal watchdog group to look into the matter joins MSNBC’s Craig Melvin to react to the ruling and how it could affect the Senate impeachment trial.