There is one obscure exception to the premise that only a natural-born citizen may become president of the United States. The Constitution does allow a person who is not a natural-born citizen to become president if he or she was "a citizen of the United States at the time of the adoption of this Constitution." This exception is said to have been added to allow Alexander Hamilton to run for president, but it obviously does not apply to Schwarzenegger or to anyone else alive today. Nonetheless, this exception keeps the argument from being sound in its present form. Reformulate the final stage of the argument to make it sound.