But citizenship by birth is established by the mere fact of birth under the circumstances defined in the constitution. Every person born in the United States, and subject to the jurisdiction thereof, becomes at once a citizen of the United States, and needs no naturalization. A person born out of the jurisdiction of the United States can only become a citizen by being naturalized, either by treaty, as in the case of the annexation of foreign territory, or by authority of congress, exercised either by declaring certain classes of persons to be citizens, as in the enactments conferring citizenship upon foreign-born children of citizens, or by enabling foreigners individually to become citizens by proceedings in the judicial tribunals, as in the ordinary provisions of the naturalization acts. - U.S. v. Wong Kim Ark, 169 U.S. 649, 702-703 (1898)
http://openjurist.org/169/us/649
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?