And what circumstances did his mother not meet?
Strongly suggest you review USC 1401 and following.
Secondly, since there is no real question of Cruz’s NBC status, please ask yourself, do you really want to elect a man who hangs his hat on that?
You said The foreign-born child is a citizen AT the moment of birth
The foreign-born child of a citizen parent is not a citizen unless the citizen parent meets the requirements of statute. http://uscode.house.gov/statviewer.htm?volume=66&page=163
I strongly suggest you review your soul.