I suspect that he did try. You have to understand that the division within gov agencies is far more partisan than even out here in the civilian world. Every single person in the chain is a potential obstacle. Its not like all of the juicy files are just sitting together in some file cabinet somewhere. Really try to imagine the process of collecting and declassifying a laundry list of documents memory holed by numerous secretive swamp laden agencies. He did wait far too long though.