A throw-away line that is flatly untrue.
Some contend that Law of Nations was influential. Even if true, this is far from it being "the blueprint." The claim is as ludicrous as the similar claim that the Constitution is based on the Iroquois Great Law of Peace.
According to Vattel and “the Law of Nations” #217 - McCain is a natural born citizen.
According to many a birther who likes to quote a mistranslation - McCain is not a natural born citizen.
Yet when asked about Vattel and his book - birthers like to engage in the historic fallacy that his book was “the blueprint for our Constitution”.
It would be funny if it were not so sad and sordid.
Where did the Founders get the idea the 13 Colonies could unite and still maintain their sovereignty? It came from Vattel’s Droit des Gens.