Trump pledges up to 15,000 military personnel at the Mexico border

In states that the president won, some Democrats facing tight races like Missouri Sen. Claire McCaskill said they embraced his hard line.
2:49 | 10/31/18

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Transcript for Trump pledges up to 15,000 military personnel at the Mexico border
Meantime tonight, the countdown is on. The crucial midterms. Late today, the president landing in Florida, and beforehand, doubling down, saying he can get rid of birthright citizenship, regardless of what some in his own party are now saying about the constitution. Our Mary Bruce today asking the president, is he using fear when it comes to immigration on the eve of the midterms? Mary tonight on the state of the race, with just six days to go. Reporter: Heading out to make his final push, president trump is ramping up his polarizing rhetoric on immigration, now ordering a massive troop surge to the border. Mr. President, what do you say to your critics who say you are fear mongering on immigration? No, not fear mongering at all. Immigration is a very important subject. As far as the caravan is concerned, our military is out. We have about 5,000, we'll go up to anywhere between 10,000 and 15,000 military personnel. Reporter: Up to 15,000 military personnel. That's roughly the same number of troops serving in Afghanistan. Three times the number deployed to Iraq. That caravan of migrants fleeing poverty and violence tonight still some 900 miles from the U.S. Border. Still, in states the president won, some Democrats in tight races, like Missouri senator Claire Mccaskill, tell me they embrace the president's tough line. Well, I think the president needs to use every tool at his disposal to make sure the border is not overrun. Reporter: Today, the president also doubling down on his pledge to do away with the right of citizenship for any baby born in the United States. I'd rather do it through congress, because that's permanent. But we can certainly do it through -- I really believe we can do it through executive order. Reporter: Most legal experts and even Republican house speaker Paul Ryan say that's unconstitutional. And in one red state on the border, Texas democratic senate candidate Beto O'rourke calls the president's immigration push pure politics. He tries to stoke paranoia and fear about a group of migrants who are hundreds of miles, weeks away from the u.s./mexico border, if they even make it this far. I think he's trying to play upon the worst impulses of this country. So, let's bring in Mary live from the white house tonight. Mary, president trump insisting he can end birthright citizenship. He would prefer to do it through congress, but he says he could do it through an executive order. Republicans are being put in a tough spot tonight, because many are being asked if they agree with him. Reporter: We saw us there with Claire Mccaskill. We spoke with her Republican opponent, Josh Holley. He's trying to walk a fine line. Pressed on this issue, he declined to say if he agrees with the president on ending birthright citizenship, but he said the constitution cannot be changed by executive order. David? Mary Bruce tonight, thank you. And we hope you'll be right here on election night. I'm be joining George and our political team, starting at 8:00 next Tuesday night. Going to be a big night.

This transcript has been automatically generated and may not be 100% accurate.

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