He wasn’t a naturalized citizen. He was born to an American citizen and that citizenship was conferred to him automatically, hence there being no need for a naturalization form. I don’t have a form n 550 either, and I am most assuredly an American citizen. Yet this is all beside the point. Why are you still focused on this subject when he lost the primary and Trump is the presumptive nominee? There are more important things to do now that we have a nominee then focus on the people that lost. How about you take some of that focus and put on Hillary or Bernie? Those are the people we need to defeat.
Do you have a born in the USA birth certificate? Cruz does not... I assure you Cruz has some form of identification other than a Canadian birth certificate, to get a US passport.