This type of idiocy wouldn't even pass muster in your local mom & pop business.
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If this were true, then an acting President couldn’t declassify anything.
But, the big picture is Joe and Hunter had Intel assessments and National Security Docs.
The president is not subject to rules and regulations established by his subordinates. He IS subject to laws passed by Congress and signed into law. That’s what the PRA is, and yes, Trump and Biden are both subject to it.
The Presidential Records Act is a law, drafted by and passed in Congress, before a former President signed it. NOT an executive order, or executive branch regulation, that Trump would have had authority over, but there are still processes that he would have had to undertaken before previous executive orders or standing policy would have been changed changed. Trump can’t just blink his eyes and it then be official, no matter how many of his supporters wish that were true. Nor do we want people like Joe Biden with that kind of power, either.
And see my link just above of the actual text of the Presidential Records Act. Trump’s claims that protects protects him are fanciful, and setting his followers up for being completely wrong on the merits, as the law makes it abundantly clear that Presidential Records remain under the control of the Government. This is independent of whether they were classified, unclassified, or wanted to be kept by the President, he has no authority to do so. They are not Personal Records, which are clearly defined in the law as well, and extremely limited in scope.