/johnny
In the case of Mr. Cruz, he cannot claim the sort of anchor-baby citizenship* that the invaders can, by accident of location of his birth, and his father was not a US citizen — I think he's a good statesman, but I'm not willing to weaken/disregard the Constitution because it suits my whims. The Constitution must be respected, especially when it is inconvenient, elsewise it means nothing.
* -- I believe this form of naturalization at/by birth is purposely portrayed as natural born
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** -- I also believe the Obama/McCain 2008 election was a set-up to ensure precedent which would weaken the NBC requirement.