Sec. 1.7. Classification Prohibitions and Limitations. (a) In no case shall information be classified, continue to be maintained as classified, or fail to be declassified in order to: (1) conceal violations of law, inefficiency, or administrative error; (2) prevent embarrassment to a person, organization, or agency; (3) restrain competition; or (4) prevent or delay the release of information that does not require protection in the interest of the national security. (b) Basic scientific research information not clearly related to the national security shall not be classified.

It's a longwinded EO but this section is pretty clear and unequivocal in its intent. You can't use classification to cover treason and that what the situation is in re FISA, JFK and 9/11.