I don't think he has anything, but I suspect he prefers to keep the operation open for purposes of guilt by innuendo.
Time to flush him out.
Sounds like a Rudy job to me ;-)
Mueller is the only threat backed by power the Deepies have. If they lose Mueller, they have no offensive capability and must needs stay on defense. The must avoid this at all costs.
Unless they win the House. Then watch out.