Assuming that reports of drumpf’s meeting with his russian handlers is accurate in the broadest facts i.e. that there were only 3 people plus russian propagandist’s in the room the constant referrals to transcipts of the meeting appears to be an acknowledgement that drumpf does have some sort of recording system in the oval office.
Even if the reports were inaccurate and drumpf had some senior personel, such as National Sec advisor, with him I find it hard to beleive they would be taking down a record of what others were saying like a court recorder.
Get the tapes. File injunction against erasure, destruction or editing of those tapes.