The problem is that the information is so specific to a group and location that it doesn't take a genius to figure who it is by process of elimination, especially knowing that there are only 2, maybe 3 viable candidates that fit the profile of the source and the 3rd one is highly improbable. People in intelligence (especially ex-KBG) can deduce the source in 5 seconds, lol. And I also bet that Trump didn't even realize what he was doing was completely inappropriate, which is what led the 2 individuals, present in the room at the time to walk out later and report that conversation to their superiors. They were shocked and very concerned at what they heard and probably thought that had they not said anything, and this came out later, they'd be complicit so they covered themselves.
The problem is his relationship with these Russians was on a friendly, business manner in his civilian past and now he thinks he can conduct the same behavior as the POTUS. Years ago he bought a home in Palm beach FLA for $40M and later sold it to a Russian "character" for $80M (don't quote me on the exact numbers but they're close). So his ties with these people raises concern and probably the reason why he won't release his tax returns since those will show the big transactions with Russians and what people are concerned with. He won't listen to any advisers and that's his biggest mistake because he thinks he can run the country like his business, being the ultimate boss and not taking advice. It doesn't work that way as president. He needs checks and balances, very experienced people advising him and him heeding that advice.
Alan Dershowitz said yesterday that what Trump needs to do immediately is lawyer up with a very experience council in ethics and help him get out of this mess. Someone who will be able to tell him "stop trying to defend everything that comes out. Keep your mouth shut and stop tweeting at any hour, let alone 3 am"!!
Every president goes through morning briefing on all important matters and gets suggestions from his top aids and advisers, this guy hardly goes to any of these briefings! That is unbelievable.
Now you have Putin saying he'll vouch for Trump on what was said at that meeting.......