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Kurt Volker: Diplomat never ‘fully on the Trump train’ set to appear as first witness in Ukraine probe
By Jennifer Hansler, Kylie Atwood & Nicole Gaouette
Explainer: Biden, allies pushed out Ukrainian prosecutor because he didn't pursue corruption cases
By Courtney Subramanian
Who is Devon Archer? 'Ukraine Gas Exec' in Trump's Nickelback Meme
By Rosie McCall
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A Brief Guide to Giuliani’s Questionable Friends in Ukraine — “Trump, Inc.” Podcast
By Katie Zavadski, Ilya Marritz & Jake Pearson
Trump involved Pence in efforts to pressure Ukraine’s leader, though officials say vice president was unaware of allegations in whistleblower complaint
By Greg Jaffe, Ashley Parker & Greg Miller
Republican senators echoed Biden in urging Ukrainian president to reform prosecutor general’s office
By Andrew Kaczynski & Em Steck
Trump Publicly Urges China to Investigate the Bidens (Published 2019)
By Peter Baker & Eileen Sullivan
Trump diplomat met with adviser for targeted Ukraine firm
By Stephen Braun & richard lardner
Ukrainegate: a guide to the US impeachment inquiry
By Roman Olearchyk, Demetri Sevastopulo & Aime Williams
Officials’ texts reveal belief that Trump wanted probes as condition of Ukraine meeting
By Karoun Demirjian, Rachael Bade & Josh Dawsey