If I were the President, I am not sure I could be as classy in meeting with anyone, especially someone who assumed he was my appropriate replacement, to question my legitimacy. Without cause, questioning the authority of someone on the claim that he was not really a citizen, seems a core character flaw of the accuser. Why extend respect to anyone who assumes he or she is above showing respect?
I am trying to imagine the quality of character this takes. The closest I can come would be imagining someone claiming that it is not necessary to recognize that I hold a doctorate. I did not display my degree and. I am not sure I bothered to ever frame this credential. However, I would take it as a sign of disrespect if I was expected to produce this piece of paper and was publicly challenged me to do this.
President Obama is such an example for us all.