www.globalsecurity.org
"The President, after all, is the 'Commander in Chief of the Army and Navy of the United States'" according to Article II of the Constitution, the court's majority wrote. "His authority to classify and control access to information bearing on national security ... flows primarily from this constitutional investment of power in the President, and exists quite apart from any explicit congressional grant."
Feel free to link to anything that refutes the right of POTUS to classify OR declassify documents.