He can determine what are his personal records or not. No exceptions. Now, NARA can take him to civil court and quite possibly win that case if he really does have national defense records, which I'm not sure he does. Why didn't the DOJ follow established procedure instead of this nonsense? Figure it out.
The Espionage Act of 1917 prohibited obtaining information, recording pictures, or copying descriptions of any information relating to the national defense with intent or reason to believe that the information may be used for the injury of the United States or to the advantage of any foreign nation.
Show me in legal terms how Trump is injuring the US and/or giving an advantage to a foreign nation.