Because it's classified.
Why do you think they cleared the floor? Only those with security clearance (held or granted on sponsor interim) and need to know were allowed in.
Mueller is smart. That is why they had to rely on him and leverage him to achieve many of their earlier plots. The cabal is a fraternity club. Even those who could be smart get by on the social and financial racketeering they run. They have some 'slick ploys' - that only work because they are all the chairs of the DC country club.
When they got in hot water because someone not in the club got into the pool, they turned to Mueller to do what he did best under the assumption they held sufficient leverage. All they had to do was lie, project, and distract - and Mueller would deliver the time they needed to work the media and make the orange man go away.
"For years I have waited for this day, pretending to obey you. Fear is freedom. Subjugation is liberation. Contradiction is truth. THOSE are the facts of this world, and you WILL surrender to them, you pig who fawns over clothing!"
I think. Mueller would look bad in heels, but if that is how his report goes, he needs the Kiryuin heel click.