There is nothing stopping the DOJ from bringing federal charges based upon evidence assembled and submitted by the NYPD. The FBI can sit it out, and probably wise for Sessions to by-pass them. They need a good kick in the pants (short of firing Comey, for now).
Look for incremental hits.The one on the West Coast about a month ago was one,there was another one on the East coast,there will be more.
I also hear a lot is going on we never hear about.