significant revelation on its own. >> joyce, how much concern do prosecutors and investigators need to have about someone to get a wiretap authorized of their phone line, particularly if that person is an attorney? >> getting a wiretap is very difficult. to get the authorization, you actually have to have very credible evidence that links the phone that you're getting the wiretap authorization for to ongoing current criminal activity. so, sometimes you'll have a consensually monitored phone call that will prove that that phone is being used. other times it will be an under cover or an informant who can say, in this case michael cohen is using this specific phone line to conduct criminal activity. that permission to even ask a court for the warrant is vetted through the criminal division