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Ukraine agency says allegations against Burisma cover period before Biden joined
By Pavel Polityuk & Polina Ivanova
Trump-Ukraine whistleblower is a CIA employee who was detailed to the White House
By Kevin Breuninger
Giuliani Sits at the Center of the Ukraine Controversy
By Alan Cullison, Rebecca Ballhaus & Georgi Kantchev
Whistleblower complaint guide: who’s who and what happened
By Kevin Uhrmacher, Kate Rabinowitz & Tim Meko
Pompeo subpoenaed by House committees for failure to produce Ukraine documents
By Kylie Atwood, Manu Raju & Jennifer Hansler
Sources: Special envoy to Ukraine resigns one day after whistleblower report released
By Devan Cole, Kylie Atwood & Evan Perez
There are still 12 House Democrats who don't support impeachment proceedings. Why?
By Christopher Michael Cillizza
'I'm the real whistleblower': Giuliani's quixotic mission to help Trump in Ukraine
By Ben Schreckinger
White House Classified Computer System Is Used to Hold Transcripts of Sensitive Calls (Published 2019)
By Julian E. Barnes, Michael Crowley & Matthew Rosenberg
Clinton's White House Faced Impeachment With Discipline. Trump's Approach Is Different. (Published 2019)
By Maggie Haberman & Annie Karni
The Trump-Ukraine whistleblower complaint, explained
By Andrew Prokop