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Colonel testifies he raised concerns about Ukraine, Trump
By Lisa Mascaro, Mary Clare Jalonick & Colleen Long
Republicans eye shift in impeachment strategy as Trump demands new attacks
By Melanie Zanona
NSC official to testify he heard Trump's Ukraine call, was alarmed and alerted superiors
By Phil Helsel & Leigh Ann Caldwell
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Former deputy national security adviser declines to show for impeachment inquiry deposition Monday
By Jeremy Herb
U.S. House to debate bill on next steps in Trump impeachment probe
By Richard Cowan, Patricia Zengerle & Lisa Lambert
Guide To Trump Impeachment Process
By Dana Farrington
NSC official testifies Trump undermined national security with Ukraine pressure
By Kyle Cheney & Andrew Desiderio