My understanding of his case was his duel citizenship, therefore split loyalties
Well, it boils down to a simple exercise in logic, Donofrio's argument does. If Barack Obama were born a subject of Great Britain, and by his own admission he was, how can he possibly be naturally born a citizen of the United States? Competing claims mean that the status is at question. Competing loyalties go against the clear intent of the framers, in raising the bar for just that one elective office, the office of President.