be authorized to declassify them (see link)...this would involve the 'Atomic Energy Act...here's an excerpt from the linked article...
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There is some classified information that is classified not necessarily pursuant to the President’s Article Two constitutional authority as commander in chief and chief official responsible for foreign relations. And the most notable example of that would be information relating to nuclear weapons, atomic energy — that information is protected by virtue of statute. There is other information that’s protected by virtue of statute, for example, the identity of covert U.S. intelligence operatives. That sort of information and other sensitive intelligence sources and methods are protected pursuant to law, not necessarily protected pursuant to the president’s unilateral classification authority. And likewise, there’s some information that we receive from foreign governments that is protected pursuant to international treaty or bilateral treaties, that likewise carry the force of law.
So even an incumbent president does not have total, unfettered authority to declare information unclassified at will. Certainly, a former president has no authority to declassify any sort of information.
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If indeed nuclear weapons related documents...and/or intelligence operative information...were being kept in Trump's home...he's gong down on this alone...and all those who aided and abetted his removal - and keepong - of those documents...wouldn't surprise me if a few underlings get squeezed very, very hard for what really went on in the White House prior to Jan. 20, 2021 and subsequently at Mar-a-Lago.
Link: https://www.grid.news/story/politics/2022/08/10/what-the-governments-former-top-classified-records-overseer-sees-in-the-mar-a-lago-search/