Who might such critters be?
Remember, the relevant standard is, entitled to US citizenship by birth, lived in the US for fourteen years, has attained the age of 35.
Winston Churchill satisfied the first and third requirements: his momma was American, having been born in Brooklyn, and, by the time things got hot, he was over 35. But he had always been an Englishman in his own mind, just as Cruz has always been an American.
There perhaps 100,000 children of American servicemen born in foreign countries, for a start. All children automatic US citizens because of one parent being US citizen.