something unexpected in the presidential race. Governor mitt romney returning to the subject of his tax returns. How much he paid and how much he'll reveal. It was a specific response a question asked... See More
something unexpected in the presidential race. Governor mitt romney returning to the subject of his tax returns. How much he paid and how much he'll reveal. It was a specific response a question asked by abc's david muir 2 1/2 weeks ago. So why does he do it today? David is right here with the story. David. Diane, good evening. As you know, the romney campaign believes the questions about the taxes are a diversion by the obama campaign. Today, the campaign clearly ready to answer that question about the income tax rate he's paid over the last decade. There's no change in medicare for seniors. None. Reporter: With a white board at his side, today, governor romney was out to declare his vision for the future for medicare is better than president obama's. But he also ended uplaring something else. The rate he's paid in income taxes over the last decade. I never paid less than 13%. I think the most recent years, 13.6% or something like that. Reporter: The answer came after a reporter asked about one of our questions two weeks ago. The question came after relentless calls from the obama campaign to for romney to release more of his tax return. And when we sat down with romney, he reiterated his stamp. Two years of returns and that's it. We started with what we did know, the one completed tax return for 2010. We know there was one year where you paid a 13.9% tax rate. Can we clear this up by asking you a simple yes or no question. Was there ever any year where you paid lower than the 13.9%? I didn't calculate that. I'd have to go back and look, but I have paid all the taxes required by law. Reporter: When we followed up the next day, it showed that mitt romney has paid up. And today, another reporter also following up. I did go back and look at my taxes and over the past ten years I never paid less than $13. Reporter: And then governor romney with that assertion by governor reed saying romney didn't pay any taxes for ten years. I paid taxes every single year and harry reid's charges are false. Reporter: We called senator reid's office. We were told he was on vacation. Is there any way to tox to the senator? No. Reporter: When you hear from governor romney that I'm still waiting for harry to. You up the source. Reporter: Even an romney. We've had a blind trust for so many years. We don't even know what's in there. It's been managed by blient trust since he was governor. I'll be curious to see it, too. Republican blasting harry reid for his unsubstantiated claim. Today, the office says romney's comments we'll believe it when we see. The obama camp's reaction to romney, diane, prove it. One more year to be released by when? October. He said he's released 2010, when the 2011 return is ready,
This transcript has been automatically generated and may not be 100% accurate.