"Yes, the president can declassify documents while in office, but there isn’t a set protocol they have to follow.
Current presidents can classify documents as long as they can “make a plausible argument that it is related to national security.” On the other hand, the president “doesn’t have to give any reason for declassifying” information, according to McClanahan.
“He can just say, ‘I decide that this should be declassified,’ and it’s declassified,” McClanahan said.
A 2009 executive order directs the head of a government agency that originally deemed information classified to oversee its declassification, and sets some rules for that process. But those protocols outlined in the executive order don’t apply to the president, McClanahan said.
The Supreme Court determined in its 1988 decision on Department of the Navy v. Egan that the president’s power over classified information comes from executive authority granted by Article II, Section 2 of the U.S. Constitution, which says, in part, that the “President shall be Commander in Chief of the Army and Navy of the United States.”
“His authority to classify and control access to information bearing on national security and to determine whether an individual is sufficiently trustworthy to occupy a position in the Executive Branch that will give that person access to such information flows primarily from this constitutional investment of power in the President, and exists quite apart from any explicit congressional grant,” the Supreme Court decision reads.
Though there aren’t specific protocols that the president must follow to declassify a document, federal courts have ruled that they will “refuse to recognize what they consider to be an inference of declassification,” McClanahan said."
Former President Trump claimed documents found at Mar-a-Lago were “all declassified.” We explain why sitting presidents can declassify documents and how it works.
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