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Colonel testifies he raised concerns about Ukraine, Trump
By Lisa Mascaro, Colleen Long & Mary Clare Jalonick
Former deputy national security adviser declines to show for impeachment inquiry deposition Monday
By Jeremy Herb
Alexander Vindman statement: White House official testifies in impeachment inquiry he reported concerns over Trump-Ukraine call
By Stefan Becket
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Guide To Trump Impeachment Process
By Dana Farrington
NSC official testifies Trump undermined national security with Ukraine pressure
By Kyle Cheney & Andrew Desiderio