Just release all the jfk assassination files.
There is a very simple reason why every President does not want to release the full JFK assassination files.
They are truly national security—because they reveal the operational methods of the CIA and other intelligence agencies who were involved in the assassination.
Those methods (imho) are still in use today—both in foreign and domestic operations.
They include the utilization of mass media by intelligence agencies, the use of “doubles” to create patsies, the creation of cover stories of various kinds, forgery, witness tampering etc etc etc etc.
They have been. What hasn't been released is a tiny portion of the total set of files tagged as "assassination related".
The files that got this tag don't necessarily say anything about the assassination at all, but are simply documents about people that are mentioned in some of the voluminous investigations. There's nothing in the remaining tiny amount of files that is going to change what we know about the crime.