Many Republicans say a "black ledger" acquired by Sergii Leshchenko is a forgery and that it was publicly released to link President Donald Trump's former campaign manager, Paul Manafort, to corruption in Ukraine.
In his opening statement, David Holmes said his work at the embassy started to become overshadowed in March 2019 by the work of Trump's personal lawyer, Rudy Giuliani, who was pushing Ukraine to carry out the two probes.
In the second day of televised impeachment hearings, one former diplomat says it's been distressing to watch the testimony of Marie Yovanovitch, who was abruptly removed from her post as US ambassador to Ukraine earlier this year.
The impeachment inquiry into US President Donald Trump moved to open hearings Wednesday. The central issue in the inquiry is what responsibility the president may carry for abandoning public duty in favor of private interests.