According to the Washington Post:
One of the meetings was a private conversation between Sessions and Russian Ambassador Sergey Kislyak that took place in September in the senator’s office, at the height of what U.S. intelligence officials say was a Russian cyber campaign to upend the U.S. presidential race.
Given the context, I find it hard to believe that Sessions would not have told State, FBI, CIA or NSA about that contact. Moreover, surely any sane politician would have written a “memo to file” as a future potential defensive tool. I would have assumed that they one or more of the above would have known anyway.
I regard the apparent absence of both (or even just a failure to report them by now), as something close of consciousness of guilt — although I have no personal knowledge of such general procedures, or what he did.
This story is just not going to go away.