He has never illustrated that he has done any in depth research on the intent behind the use of the phrase at issue in Article II of the Constitution. Can you point to any?
Here is a Breitbart interview where Levin discusses Article II and other clear reasons Cruz is a natural born citizen:
I also think this article utilizing Court reasoning in Heller is quite important and clear:
http://www.breitbart.com/big-government/2016/01/11/ted-cruz-eligible-second-amendment/