Hes probably been told by the FBI not to talk about it.
Whats puzzling to me about the story though is that he supposedly met Papa in March 2016 but he did not tell the FBI until after the Wiki dump. But the Wiki dump occurred on Oct 7, long after the investigation began ( ie the investigation began in June 2016 according to Comey). So how could the information have triggered the investigation? The investigation had been underway for four months already.
Sounds fishy to me. No doubt sounds legit to Sessions.
Since when does a foreign diplomat care what the FBI "tells" them to do?
On the one hand, he has diplomatic immunity in the United States, and on the other hand, this conversation happened in Great Britain, where the FBI has no jurisdiction.
-PJ