Then, some anonymous source which apparently either wiretapped the meeting or was present at the meeting, leaked the same information to numerous news agencies, complaining that Trump shared the information with the Russian diplomats.
Consider that sharing targeted anti-terrorism information with partners against a common enemy is doubtless something that presidents have done many times in the past. Also consider, that, if the source of the story was really concerned about the safety and secrecy of whatever intelligence assets were involved, he/she completely blew this up by leaking the information to multiple newsrooms where doubtless the details have now been seen by many, and possibly could make their way to ISIS itself.
There was one person who committed a crime at this meeting, and it was not Trump. It was the person who leaked the "highly classified" information to the world, doubtlessly endangering the safety of whatever intelligence asset is involved.