Didn’t Diane Fineswine do that?
Yes, that's it. She released 300 pages of Fusion GPS co-founder Glenn Simpson testimony. Probably to help other in the scheme tailor their testimony so as to avoid obvious perjury, or otherwise "stick to the script" so all the stories lined up.
Her justification for the release was a lie, of course.
"The innuendo and misinformation circulating about the transcript are part of a deeply troubling effort to undermine the investigation into potential collusion and obstruction of justice. The only way to set the record straight is to make the transcript public."
That and a head cold, IIRC.