Just saying, the psyops can play on several levels, and it is entirely possible that Sessions is a sacrificial pawn (although I doubt that is the case).
If nothing else, the recent tweet goes toward making "investigation into FISA abuse" a foregone conclusion. The DEM narrative has been that there is nothing to investigate.
There is no way the President wants confirmation hearings for a new AG at this point with the mid-terms coming up soon.
When I read the about this tweet, my first thought was "head fake."