Dems win court fight forcing key Trump aide to testify on impeachment

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A federal judge has ordered Don McGahn to testify before Congress, despite having stonewalled subpoenas. The decision could bolster John Bolton and others to testify in House Dems’ impeachment probe, despite claiming ‘executive privilege.’ David Frum, Neal Katyal and Leah Wright Rigueur join Ari Melber to discuss breaking developments.