Itās President for the former President.
You gerbil.
Addressing a Former President of the United States
When addressing a former President of the United States in a formal setting, the correct form is āMr. LastName.ā (āPresident LastNameā or āMr. Presidentā are terms reserved for the current head of state.) This is true for other ex-officials, as well.
OK Hamster? He's Mr. Trump for you and me.