No, you can show your foreign BC, a parent's US BC, plus your parent's marriage license.
Those are methods of establishing citizenship after the fact. They are not the validation of US citizenship on the birth of the child. We always had the troops overseas register their kids right after birth. Why? Because it left no doubt.
So, do you think if Cruz had a Consular Report of Birth Abroad, CRBA that it would hurt something to show it?
Breaking News....
Trump says Cruz may have trouble because his Mom had an epidural at birth.
SCOTUS to rule in emergency hearing!!!
Stay tuned.