US diplomat directly ties Trump to Ukraine quid pro quo
By Kylie Atwood, Jeremy Herb & Manu Raju
Ukraine Knew of Aid Freeze by Early August, Undermining Trump Defense (Published 2019)
By Andrew E. Kramer & Kenneth P. Vogel
William B. Taylor, acting U.S. ambassador to Ukraine, testifies in impeachment probe
By Rachael Bade, Karoun Demirjian & Anne Gearan