The question is "why"?
Think they have to much info on the McCainites, and they do not want it exposed, bet they were craping their pants today of the meeting going on with them.
To get some idea of who would want to sabotage relations between US and Russia, just ask yourself who would stand to lose from such a relationship.
Possible answers : China, Saudi Arabia, plus some others. And the list of suspects have money to buy politicians and reporters.