Mueller link seen in mystery grand jury appeal The special counsel appears to be locked in a dispute with a mystery grand jury witness, but much of the case is sealed.

NEW: If you're still up, some Mueller news: special counsel appears to be embroiled in a mystery grand jury fight at the DC circuit. Arguments set for December. Looks like Katsas recused. W/@dsamuelsohn https://t.co/ZQpoLCFiDg

— Josh Gorestein (@joshgerstein) October 25, 2018