Transcript for Exclusive: Donald Trump and Mike Pence Set to 'Divide and Conquer'

You can tell she is already prepping. You had a busy day. You raced across the state and spoke with both of them. We didn't get a speeding ticket but it was close. We headed to the county fair where Donald Trump was, a huge crowd gathered and he pointed to those crowds but also pointed to the polls saying he is on the rise. What does he mean when he talks about Hillary Clinton's stamina, we asked and about what she said, did he choke? Isn't it divide and conquer? 63 days to go. It is. Very rarely will we be together like maybe once every two weeks. We like it because we like each other but the fact is it's better when Mike goes someplace a and I go someplace. You often talked about Hillary Clinton's Stam that and said she didn't look presidential. I really do believe that if what do you mean by that? I don't think she has a presidential look and you need a presidential look. You have to get the job. I think if she went to Mexico she would have had a total failure. We had a big success. When you talk about her not looking presidential, are you talking about aesthetics. I'm talking about general -- by the way, she says things about me that are horrible. The single greatest asset I have is my temperament but she came up with this Madison avenue line let's talk about his temperament. It's the single greatest asset I have is my temperament. Reporter: Trump knows his opponent is here too. Hillary Clinton who is also here in Ohio as you know told us a short time ago you choked, that the idea of Mexico paying for this wall has been central to your campaign. Did you choke? So, let me just tell you about joking. I don't joke. She jokes. She's spoven for so many bad things that happened to our country including the signing by her husband of nafta which has drained our country of its jobs. I've been given a plus including by you people but I've been a pluses for the job I did in Mexico and the fact that Mexico will pay for the wall. It was discussed that it wouldn't be discussed but they know my stance and I know their stance. Did the Mexican president break his word in talking about it. We had ground rules and that's okay. See who winds in the end. We'll win 100% they'll pay for the wall. Governor pence, you're making news in revealing you'll release tax returns. Sure. Pretty quick read. Pretty quick read. I'm curious. Do you think the American voter has the right to see the tax returns of Donald Trump before they vote on election day? You know, I'm very pleased to provide our tax returns. You're going to find out my family is a middle class family and that Ty will be pretty clear evidence we haven't profited from our 16 years in and around public life. But, governor, I'm asking about Donald Trump and every presidential candidate -- Look, I'm re-releasing my tax returns. Donald Trump will release his. I'll give mine to y'all this week and he'll provide his after a routine audit is done is there as far as mine are concerned the only one that cares is the press. It's no the a big deal. You don't think there are any voters. I think people don't care. I'm not sure about that. We've heard from a lot of voters saying they want to see his tax return and he is the only one in recent history not to release. We'll press him further and ask him about immigration and where he is going with undocumented immigrants and leave the door open for undocumented immigrants to stay had this country. You'll see how he answers that and the debate we asked about the debate too. Anyone playing Hillary, we asked. He said I'm not preparing in a traditional way. We'll think about it. Not even holding mock debates. Everything has been untraditional. Why change now. I think you have more to say about this and you will tonight, more of your interview on "World news tonight" with this guy, David Muir. Thanks, guys. Back to school here.

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