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Colonel testifies he raised concerns about Ukraine, Trump
By Lisa Mascaro, Mary Clare Jalonick & Colleen Long
Key Witness in Impeachment Inquiry Asks Federal Court to Rule Over Testifying (Published 2019)
By Michael S. Schmidt
National Security official to testify he heard Trump's Ukraine call, told superiors of his concerns
By Phil Helsel & Leigh Ann Caldwell
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John Bolton — Democrats' Newest, And Unlikely, Ally Against Trump
By Mara Liasson & Domenico Montanaro
NSC official testifies Trump undermined national security with Ukraine pressure
By Andrew Desiderio & Kyle Cheney
Former deputy national security adviser declines to show for impeachment inquiry deposition Monday
By Jeremy Herb
White House Ukraine expert to testify he reported concerns about Trump-Zelensky call
By Paul LeBlanc, Zachary Cohen & Jake Tapper