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No, it's not protocol, and I don't remember any other former president being called that. Per Emily Post "When addressing a former President of the United States in a formal setting, the correct form is “Mr. LastName.” (“President LastName” or “Mr. President” are terms reserved for the current head of state.) This is true for other ex-officials, as well." emilypost.com/advice/ad…
No, it's not protocol, and I don't remember any other former president being called that. Per Emily Post "When addressing a former President of the United States in a formal setting, the correct form is “Mr. LastName.” (“President LastName” or “Mr. President” are terms reserved for the current head of state.) This is true for other ex-officials, as well." https://emilypost.com/advice/addressing-a-former-president-of-the-united-states