by virtue of being born to my mother in calgary i was a citizen by birth. >> the leading republican candidates also clashed on the issues. trump accused cruz of opposing ethanol in iowa because of support from the oil lobby. cruz took a different position than trump on a deportation force to catch those in the u.s. illegally. >> door-to-door we don't have any system that knocks on the doors of every person in america. that is not actually how the american law enforcement system works. we also don't have people going door to door looking for murderers. we don't live in a police state. no, i don't intend to send jack boots to knock on your door and every door in america, that's not how we enforce the law for any crime. >> my primary opponent in iowa, only in iowa, because actually ted isn't doing well at all in new hampshire but in iowa he's doing well and my primary opponent was totally apposed to ethanol and the ethanol industry