This man sat in the Oval fucking Office and...check notes...counseled the President of the United States domestic policy.

It was provided by reporter(s) that were with Trump gathering background for Mark Meadows book. He knew they were there, who they were and presumably he was being recorded, or at least being transcribed, and felt it appropriate to share those files. Assuming they and the aides in the room are on the witness list, which apperently will be unsealed unless the Special Council appeals today's ruling.