Joe Biden 'Confident' Hillary Clinton Will Be Elected President

New polls show Trump getting closer to Clinton in key battleground states.
2:47 | 05/10/16

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Transcript for Joe Biden 'Confident' Hillary Clinton Will Be Elected President
In the meantime tonight, to major new developments in the race for the white house. With the next round of primaries being held today, tonight, new signs of possible trouble for Hillary Clinton in the general election. In three crucial battleground states, take a look tonight. New pomes out this evening showing Donald Trump closing in. In Florida, just one point behind. In Pennsylvania, the same. While in the must-win state of Ohio, Clinton is actually trailing trump. Tonight, the trump campaign is answering new questions, did they select a delegate who is a well-known white nationalist? ABC's Cecilia Vega on the campaign tonight. Reporter: Tonight, it is the closest the white house has come to an endorsement. You bring up the next president. We're all anxious to see who that -- Who she is? Reporter: Vice president Joe Biden telling robin Roberts this election is Hillary Clinton's to win. I feel confident that Hillary will be the nominee, and I feel confident she'll be the next president. Reporter: Until now, the administration only going as far as a joke about that possibility. Next year at this time, someone else will be standing here in this very spot, and it's anyone's guess who she will be, but -- Reporter: But even with a Biden boost, Clinton tonight bracing for a loss to Bernie sanders in West Virginia. But it is still virtually impossible for the Vermont senator to clinch the nomination and cult into Clinton's more than 700-delegate lead. Clinton's sights now set on Donald Trump. So, I think with somebody like Donald Trump, you would see a race to the bottom, across our country, with working families paying the price. Reporter: She's hoping women help her win the battle. Polls show she's beating trump in three battleground states, and many in his own party worry comments like this will not help. She's married to a man who was the worst abuser of women in the history of politics. Reporter: Late today, trump facing his own new controversy. One of the people on his list of California delegates is prominent white nationalist William Johnson, whose group recorded robo-calls supporting trump. He will put America first. Furthermore, he will respect all women and help preserve western civilization. Reporter: The campaign tonight blaming it on a computer error, saying they didn't mean to submit Johnson's name to the convention. And Cecilia Vega joins us now from Kentucky. That campaign team aware of the battleground Numbers today, troubling for team Clinton. In the meantime, Cecilia, Donald Trump says he's narrowed down his list of potential running mates? Reporter: He says he's narrowed it down to five or six people, he will give extra weight to someone with political experience, and one name, David, that we know is on that list tonight? Former rival Chris Christie. A right, Cecilia Vega in Kentucky for us. Thank you, Cecilia. Back to the vice president for a moment. Robin Roberts will have much more of her exclusive interview with Joe Biden on "Gma" tomorrow morning about the 2016 race, about Donald Trump and about Biden's own moonshot cancer initiative. That's tomorrow on "Good morning America."

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

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