Traditionally there always has been:
https://www.cbsnews.com/news/trump-classified-records/
You might well be right, but let me ask this. Do you think it would be a positive thing for declassification to work in the way Trump supposedly did? Wouldn’t you want some sort of check on that power?
The courts let Bill Clinton walk for doing the same thing Trump did and established that the president can determine what are personal records or what is to be archived. Clinton followed no formal process either. As I said I'm good if we change the law.