academic who teaches in britain. u.s. officials told cnn that the source wasn't iedded in the campaign despite statements from the president and his allies suggesting otherwise. >> for a long time we were told there was some kind of infiltration. i believe if there was an imbedded person, that person cleared us. giuliani also saying during negotiations with mueller's team over the potential interview, investigators say their obstruction probe could wrap up by second first if the president agrees to sit down and answer questions. this as a "times" reports mueller is looking into another controversial meeting at trump tower involving the president's son three months before the election. prominent trump supporter erik prince arranged the meeting with george nader.