He probably knows there are four sealed indictments from this grand jury already.
I have heard the “4 sealed indictment rumor”. Not sure if its true. Manafort was handed a True Bill on 10/27(Friday). IT was announced without names on Friday night. I fail to see how they obtained 4 other sealed indictments since Friday. The greek guy plead to an Accusation. He was not indicted. He was working with Mueller since July. I doubt he would have 4 sealed indictments and not release them at the same time. That could be a legal problem.