[Sherman Logan]

Others believe that the definition should be more narrow and limited to “one born of parents who were US citizens at the time of the birth.”

There are a number of possibilities here.

Born in US to two citizen parents. NBC by any criteria.

Born in US to one citizen and one non-citizen parent. (BO's situation.)

Born outside the US to two citizen parents.

Born outside the US to one citizen and one non-citizen parent. Some believe father or mother being citizen should make a difference.

Personally, I define NBC as "citizen at birth."

But would take SCOTUS ruling to settle it.

[Sherman Logan]

Sorry, forgot born in US to two non-citizen parents. Also known as the anchor baby.

[Las Vegas Ron]

Personally, I define NBC as "citizen at birth."

So, Putin, Chavez, Castro could pop a kid here, and the kid is a NBC?

Nuts, that is not what the Founders or the 14th intended.