Would not common sense dictate to a nominee to urge their subordinates of this concern of the FBI? That is exactly why we are, where we are with the dufus being under investigations and the crooks around him going to jail. Maybe the dufus knew what his staff was doing and wanted plausible deniability because he is as sleazy as they are truth be told. Maybe they kept him informed of what they were doing, in his behalf, except Manafort, who was obviously a self enriching agent for Russia.
Yes the dufus's past behavior is enough evidence for me to say that with a lot of confidence.