Exclusive: Lev Parnas has given damning details and documents on Trump's apparent pressure on Ukraine to announce an investigation into Joe Biden and Burisma. But Ukraine denies it.

Ukrainian Foreign Minister @VPrystaiko: "Frankly I don't trust any word [Parnas] is now saying." pic.twitter.com/kOmctsZvgU

— Christiane Amanpour (@camanpour) January 16, 2020