A natural born US citizen is “born in the USA” of two citizen parents. Cruz is a natural born Canadian at best.
A natural born citizen is one born with exclusive allegiance to the US at birth, no matter where that child is born. In international law, it is called the law of ‘statelessness’. A person can not be born without allegiance to some nation and if the country the child is born in a country that does not recognize as citizens, children born to US citizen parents temporarily residing in that country such as France, then that child for all intents and purposes a natural born US citizen at birth.