He should carry a copy with him in case anyone is in doubt. You know he favors the Doubting Thomas approach to this subject.
Why did he give up his Canadian citizenship some forty years later? Is that a required act of becoming a natural born American citizen?
Why can’t a natural born Citizen
keep his inherited Citizenship?
When something is natural, it can’t be changed. Why is he changing his citizen status in foreign countries?
My daughter has dual Citizenship at birth. Can she change that fact by giving up what she inherited at birth? No. She will always be born a dual citizen, like Ted Cruz.