It’s required to claim US citizenship.
He has a file, we need to see it.
IIRC, she did not. I believe that she did for an older child (deceased) with another husband, in England, so she knew to do it, but she did not do it for Ted. I believe he had to do some legal work as a teenager, after they had moved to Texas, in order to go on a class/school trip outside of the country.
That is my recollection as well.
He did not get a US passport until he was a teen and needed one for a class trip.
He was still a Canadian citizen until 2014.
There is no way that the founders would have considered him a natural born citizen.