The forms used for background checks would presumably ask citizenship status. Assuming he filled those out accurately (and I do assume that), he had to be aware that he was a dual national. Why keep it? Its not like travel to Canada is restricted or anything.
IRREFUTABLE AUTHORITY HAS SPOKEN
(Oct. 18, 2009) The Post & Email has in several articles mentioned that the Supreme Court of the United States has given the definition of what a ‘natural born citizen’ is. Since being a natural born citizen is an objective qualification and requirement of office for the U.S. President (and VP), it is important for all U.S. Citizens to understand what this term means.
http://www.thepostemail.com/2009/10/18/4-supreme-court-cases-define-natural-born-citizen/
I haven’t had to go thru a security clearance since the early 1960s when there was no such thing as ‘dual citizenship.’ Back then, to become an American citizen you had to renounce any other citizenship.
In those days the Q would have been: are you an American citizen? Only a Y/N answer was possible. Nowadays, I suppose they ask if you are also a citizen of any other country(ies), and what country(ies) that would be if you answered ‘yes.’
But isn’t the story that Cruz never knew he was a dual American-Canadian citizen until he started his presidential quest? And then renounced the Canadian citizenship? I thought I’d read somewhere that he didn’t know that status. But what do I know? I can’t follow all this, gets too mired down.