pearance from a judicial proceeding, it only excuses the witness from having to answer questions that call for answers covered by the privilege. See Roe l. Slotnick , 781 F.2d 238 (2d Cir. 1986); McKay I C.I.R. , 886 F.2d 1237 (9th Cir. 1989). Accordingly, the United States asks the Court to compel the witnesse