I have to admit that left is far better at coming up with stories and excuses to cover things up. They would have at least tried to make up something sounding a little bit credible.
If it were me (and I did not want to release the files for whatever reason) I would have:
(1) Played the national security card.
(2) Promised that files would be released once national security issues had been resolved
That buys time—you can stall indefinitely with that.
Let Vance with it in 2029.
Lol.