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That is a recommendation, not a law. That’s what agencies are to do, the President can and does declassify at will, and a Federal Judge on a Bill Clinton case said that “sole, at will” power carries on after a President is out of office for Docs during his administration.
There are numerous pictures of Biden holding Clasified Docs outside a SCIF and the guy next to him is holding a cell phone.
Media has reported in the VP days that Joe Biden did Media Interviews with Classified Docs, open and strewn about his desk. Biden had no power to remove them from a SCIF.
Your relying om Bill Barr? I think this fued is driving some freepers crazy.