Obama Campaign to Romney on Taxes: 'Prove It'

White House continues call for presumptive GOP nominee to release tax returns.
3:00 | 08/17/12

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Transcript for Obama Campaign to Romney on Taxes: 'Prove It'
And mitt romney ready to address that question about his taxes. While the white house is responding to talk about replacing joe biden. One familiar face saying, go with hillary clinton. It is "your voice, your vote." And abc's david muir just back from the trail this morning, sorting through it all. Never a dull moment, right, josh? Good morning to you. Governor romney seemed ready to answer that question. But not without arguing that with 23 million americans out of work, the fascination with the taxes I paid, I find to be very small-minded. But democrats remain firm this morning, after romney revealed his tax rate. The obama campaign saying, prove it. This morning, mitt romney revealing the most yet about the rate he paid on his income taxes, after relentless calls from the obama campaign to release more than the two years of tax returns romney has promised. Over the past ten years, i never paid more than 13%. I think the most recent year is 13.6% or something like that. Reporter: Romney went back and checked after our sitdown with him two weeks ago. At the time, we asked him about the tax rate he paid and the one completed tax return he has released. Was there ever a year you paid lower than the 13%? I haven't calculated that. I'm happy to go back and look. But my view is, I have paid all the taxes required by law. Reporter: Now, romney answering that question. And taking aim at harry reid, who said a source told him romney didn't pay taxes for ten years. I'm waiting for harry to put up who it was that told him what they told him. Reporter: We called senator reid's office. We were told, reid is on vacation. Are you going to release the source? Meantime, romney's running mate, paul ryan, was asked about reports that ryan requested stimulus funds for wisconsin. Studying letters written by ryan's office in 2009. I haven't seen the report. I can't comment on it. Reporter: In a statement afterwards, ryan acknowledged and defended those letters, calling them constituent services. While campaigning in ohio, ryan went on the offenses. Having fun at vice president joe biden's expense, which this week confused which state he was in. It is great to be in north canton. Or as joe biden might say, it's great to be here in nevada. Reporter: Republicans suggest that obama replace biden on the ticket. One place I would not go for RUNNING MATES IS senator McCain. Reporter: A reference to sarah palin. Bobby jindal going after joe biden now. Saying of romney's pick of paul ryan, it was a bold choice. But the bolder choice was made by the president, he said, in keeping joe biden.

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

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