I am saying that “Natural Born” has a meaning and it was well known at the time of the adoption of the Constitution. That is why the clause, “...or a citizen of the United States at the time...” was put in there. Natural meant that both parents were “citizens” or for the British, “Subjects”. There was a definite meaning for those words. Both parents had to be Citizens for you to be a “Natural” citizen just as both had to be “Subjects” to the Crown to be “Natural” subjects. Your place of birth is irrelevant as regards the “natural” element.
Maintaining foreign (Canadian) Citizenship from Senator Cruz’s birth until May, 2014, seals the deal, with all due respect to Mr. Robinson, he doesn’t even come close to meeting the Constitutional standard.