Romneys father was Mexican, McLame was born in a Panamanian hospital.
Romney’s father was born in Mexico to two American citizens, making him by the laws of the time an American citizen, though arguably not a natural-born citizen. Romney himself was born in the USA to two American citizens, making him NBC by even the most stringent standards I’ve seen proposed.
You seem to be proposing that the parents of a presidential candidate must themselves be NBC, which I think carrying the argument a generation too far.
Are you proposing that the child of two American citizens serving overseas in the US military should be ineligible for the presidency because his parents served their country? Doesn’t that sound just a trifle harsh even to you?