threshold he has to. >> the biggest crack in his armor, i think, if there is one, upscale republican voters question whether he has the temperament to be president. particularly managing foreign policy. i think he has to show he can be strong. >> on the graphic it says donald trump can't be dragged into arguments but he's always dragged into arguments. >> out on the stump, he hits hard and in a couple of the debates he faded into the background. he needs to be careful of that, too, particularly when they get into the foreign policy issues that he's not as well versed? >> don't underestimate the value of emotion in talking about foreign policy. there's a lot more leeway than strong economics. the key matchup has to be made, maeve, ted cruz with trump. he's the presumptive leader. you have to capture the momentum when you have it. we saw what happened with fiorina. she got it, she didn't seize it,