Who did you have in mind, Ted Cruz?
Honest, nobody.
I was just wondering about this possible loophole, where somebody is born in the US and has US citizens as parents. Their citizenry was not given up, but they spent time in a foreign country, like Canada, that allows dual citizenship for the Prime Minister. After serving his time, he returns to the US and works to get himself nominated as a nominee.
Just the principle, nobody in particular.