I don't doubt that's their logic, but below the office of the POTUS it isn't true.
For that matter, the power of the POTUS to declassify things is part of the overall asssumed powers, not explicitly set forth in law anywhere (so far as I am aware), but increasingly supported by SCOTUS decisions.
In precise, dried-ink legal terms, if I am someone entitled to read classified information, and mark my grocery list top and bottom with the appropriate signage, that stupid list actually becomes classified. Sharing it with a friend then literally becomes a federal crime. Declassification is a specified process, involving review and approval by authorities (not me), or expiration of the classified period (a default for low levels of classification - it can of course be renewed).
For that matter, the power of the POTUS to declassify things is part of the overall asssumed powers, not explicitly set forth in law anywhere (so far as I am aware), but increasingly supported by SCOTUS decisions.
In precise, dried-ink legal terms, if I am someone entitled to read classified information, and mark my grocery list top and bottom with the appropriate signage, that stupid list actually becomes classified. Sharing it with a friend then literally becomes a federal crime. Declassification is a specified process, involving review and approval by authorities (not me), or expiration of the classified period (a default for low levels of classification - it can of course be renewed).