Colonel testifies he raised concerns about Ukraine, Trump
By Mary Clare Jalonick, Lisa Mascaro & Colleen Long
Former deputy national security adviser declines to show for impeachment inquiry deposition Monday
By Jeremy Herb
Guide To Trump Impeachment Process
By Dana Farrington
White House Ukraine expert to testify he reported concerns about Trump-Zelensky call
By Paul LeBlanc, Zachary Cohen & Jake Tapper
NSC official testifies Trump undermined national security with Ukraine pressure
By Kyle Cheney & Andrew Desiderio