>> woodruff: that was donald trump in myrtle beach today, taking a softer line after his flare-up with pope francis. the pontiff had said trump is not a christian if he advocates building a wall along the mexican border. >> they had him convinced that illegal immigration was like a wonderful thing. not wonderful for us. it's wonderful for mexico. >> woodruff: in turn, the vatican said the pontiff's comments were "in no way a personal attack, nor an indication on how to vote." trump, though, faced continuing attacks from his republican rivals, while defending a lead that some polls suggest may be shrinking. texas senator ted cruz also campaigned in myrtle beach: >> it's easy to say "make america great again." you can even print that on a baseball cap. but the question to ask is, do you understand what made america great in the first place?