BERMAN: All right. Just into CNN, a Republican presidential candidate responding to Donald Trump. This has become a full-time job. Let me remind you a brand new CNN/ORC poll shows Donald Trump out in front of the Republican field. There he is with 24 percent of the vote right now. That number is up, way up, from July in the CNN poll. He's not only winning though, he's also out in front of the issues as well. On immigration, more Republicans trust Donald Trump on immigration than any other candidate by a huge margin. Just this week Donald Trump put out his immigration plan. Among other things, he suggests he would do away with birth right citizenship. That's the notion enshrined to the 14th Amendment that if you are born in the United States, even if your parents were not legal residents, if you are born here, you are a citizen. Donald Trump has suggested to get away with that. And just now in Iowa at the Iowa State Fair, Senator Marco Rubio responded. Listen.</s>SEN. MARCO RUBIO (R-FL), PRESIDENTIAL CANDIDATE: It's an important issue. It has been for 20 years for this country, for 30 years. It needs to be addressed, and on multiple fronts though. It's not just illegal immigration. That's a significant issue, of course, but we also have a legal immigration system that needs to be reformed. We compete globally for talent and we want to ensure we are still capable of doing that. Canada actively recruits against us. They put up billboards that actively tell companies, move your facilities to Canada because we can help you attract the workforce that American can't keep. So we have to deal with those issues.
Rubio Says Trump Wrong, Don't Repeal 14th Amendment