Even assuming that Trump declassified the documents, that doesn’t make them his. The law specifies that if the documents were related in any way to the official or ceremonial duties of the office of the President, they are presidential records and belong to the United States. Classified or declassified does not matter.
Classified or declassified does not matter.
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It does matter.
That might be a valid point if Trump was in fact charged with holding just presidential records.
But he is facing 37 charges of CLASSIFIED documents.
The burden is on the prosecution to prove they were classified.