You are entirely correct, and since you agree that Congress has the authority to declare who is a natural born citizen, then suggest you review how Congress did exactly that in USC 1401, and how Mr. Cruz meets every requirement of that law.
Please, this is settled.
Is this a matter Trump supporters are proud of?
> since you agree that Congress has the authority to declare who is a natural born citizen
Read the law.
> since you agree that Congress has the authority to declare who is a natural born citizen
Your posts mark you as a fool.
The controlling law is the Immigration and Nationality Act, Pub. L. No. 82-414 § 301(a)(7), 66 Stat. 163, 236 (1952). http://uscode.house.gov/statviewer.htm?volume=66&page=163
Note that the foreign-born child of a citizen is not a citizen unless the citizen parent meets the requirements of this statute. The foreign-born child is not a citizen by birth, the foreign-born child is a citizen by this statute.
Statutes “conferring citizenship upon foreign-born children of citizens” is naturalization. U.S. v. Wong Kim Ark, 169 U.S. 649, 702-703 (1898) http://openjurist.org/169/us/649