foundation. it indicates mueller's team is trying to determine whether stone had other go betweens for wikileaks. the washington post first reported the special counsel's interest as a possible intermediary. his attorneys declined to excellent. back in september his said his client was never in touch with wikileaks or its founder. for stone's part he maintains that he was the principal intermediary adding i had no advance knowledge of the source or content. stone says believes mueller could bring charges as a pressure tactic. >> robert mueller and his partisan team of prosecutors