There’s been a lot of talk about that lately. Tucker said that when Trump was going to release all the Kennedy assassination files as he promised, Pompeo (CIA) talked him out of it. Release those files!
The reason Trump did not release the JFK files is because the files support the one shooter, one bullet, narrative.
Trump was fearful that millions of voters would be enraged at him personally if the confidential evidence did not support the conspiracy theories.
The confidential files mostly refer to Kennedy family and Democratic Party secrets, and to witness and informer statements that could not be verified.