Volker a flat out liar, too.
No surprise there.
https://www.washingtonpost.com/politics/2021/06/11/new-questions-about-key-gop-impeachment-witness-trump/
It was literally, you know, Let me introduce, you know, Mr. Giuliani, Volker said. Let me introduce Mr. Yermak. Volker might have been referring narrowly to his own role, but the call lasted more than 40 minutes and dealt with plenty of the substantive subjects that would later come up in the impeachment trial.
Volker declined to comment to Mother Jones, saying, I have nothing to add to what was already covered in my public testimony. He also declined to comment to The Washington Post.
Volker has already clarified his testimony, to some degree, allowing that perhaps there was more of a quid pro quo than he had personally been aware of. His testimony that he was unaware of a quid pro quo was also called into question by a contemporary text message in which he seemingly referred to one of the key carrots in the Giuliani-Trump effort: Zelenskys much-desired White House meeting.
Heard from White House assuming President [Zelensky] convinces trump he will investigate / get to the bottom of what happened in 2016, we will nail down date for visit to Washington for Zelensky, Volker said.
One of the witnesses Republicans initially highlighted, Sondland, later confirmed there was a quid pro quo, effectively turning him into a hostile witness for Trump. This would seem to point to valid questions about the testimony of a second key witness cited in Trumps defense.