konstantin kilimnik, an associate of manafort's, who is described in court documents as a suspected russiangence operative. also indicted, 13 russian nationals and three russian entities charged with interfering in the 2016 election. and most recently, another group of 12 russian nationals charged with hacking the democratic national committee and the clinton campaign. could more charges be coming? his team has interviewed at least two dozen members of the trump administration and other trump associates. >> bob mueller is not making deals left and right. rick gates, george papadopoulos, and michael flynn all traded some pieces of information for their respective plea deals. that's presumably incredibly important information. >> reporter: one crucial remaining question, what has mueller found out about that june 2016 trump tower meeting between donald trump jr., paul manafort, jared kushner, and russians who promised to share dirt on hillary clinton? trump junior has said that he never told his father about the meeting. >> there was nothing to tell. it was literally just a wasted 20 minutes,