Missed it too but I'm pretty sure he said, "…bought and paid for dossier."
I'm really surprised we haven't seen Quentin Tarantino's name brought up here many times. That guy is a freak for sure!
Key word in your post is "involves"
Anyone remember this post?
https://www.c-span.org/video/?462628-1/robert-mueller-testifies-house-judiciary-committee