going to get attacks. this is the race for presidency. everything is fair and love and war and a republican primary is war. >> it will be interesting to see on the debate stage tomorrow night how trump and cruz deal with each other. in the past we've seen them back off when they are on stage face-to-fa face-to-face. he told trump told erin burnet he won't bring up the issue of cruz' citizenship and eligibility. >> he probably won't be trump bringing it up. he tends to like, to fight off the debate stage in rallies or on twitter but certainly i imagine it will come up with those moderators. it is on the minds of people at this point even though 85% of likely caucus goers in iowa said it isn't of concern, it doesn't bother them, this issue of cruzs citizen ship and eligibility for the presidency. 15% of iowa caucus goers said it