johnny ann thompson is here now with more on the campaign trail. >> yeah, well, trump's opponents are saying he's not a reliable conservative. meantime hillary clinton easy grip on the democratic nomination is starting to weaken. >> reporter: for donald trump, his biggest lead nationally. it comes with trump poised to win saturday in south carolina. >> i thought years ago -- or a year ago, it was a joke when he put in his hat to run, and now he might get my vote. >> with three days until the vote. >> let us come and have a good result in south carolina. >> you all have the chance to reset the race. >> reporter: trump's rifles are saying that's not conservative. >> i am pro dmois every respect. >> reporter: that was in 1999, part of a current ted cruz ad. he is warning that trump would not put a pro-life justice, pro gun justice on the supreme court. >> a vote for donald trump is a vote to erase the second amendment from the bill of rights. >> reporter: trump says he has changed and might sue cruz. >> i never dealt with anybody that lied so much. >> reporter: hoping to replace cruz as