We're going to turn to the race for the white house now. It's "your voice, your vote." All of the action in new york. President obama will address the united nations. Both candidates will attend... See More
We're going to turn to the race for the white house now. It's "your voice, your vote." All of the action in new york. President obama will address the united nations. Both candidates will attend president clinton's global initiative. And the president and the first lady stopped by "the view." First, let's get to jake tapper and more on the president's u.N. Speech. Reporter: Good morning, george. Mitt romney and paul ryan will be kicking off a bus tour in ohio, to regain momentum in a state where they're trailing. But president obama will be at the united nations, telling the assembly of leaders that the united states will do what we must to prevent iran from obtaining a nuclear weapon. A senior administration official tells abc news this morning in new york city, in front of the united nations, president obama will reiterate the u.S. Commitment to preventing iran from iracquiring a nuclear weapon. And the u.S. Will not shrink to justice, those who harm americans. Sensing an opening, mtitt romney has been assailing the president for calling the situation bumps in the road. We had an ambassador assassinated. And iran is that much closer to building a nuclear weapon. Reporter: The white house says the president was referring broadly to transformations in the region. There's a rather desperate attempt to grasp at words and phrases here, to find political advantage. And in this case, that's profoundly offensive. Reporter: Theney campaign is also posting to a clip online about the president's "60 minutes" interview, about his campaign ad. Do we see us going over the mistakes that are made or areas where there's no doubt that somebody could dispute how we are presenting things? You know, that happens in politics. Reporter: The romney campaign calls that a reckless disregard for the truth. But the president is giving, as well as he gets. Sitting down with the first lady to talk to the ladies of "the view," aboutitt romney's tax returns and whether it's fair that romney pays a lower tax rate than somebody paying $50,000 a year. I think that's the way you get economic growth. I've got a different vision about how we grow an economy. I think, barbara, you grow an economy from the middle-out, not from the top-down. Reporter: The president will, of course, have an international focus today at the u.N. The prest will say, quote, we must affirm that our feature will be determined by people like former ambassador chris stevens and not by his killers.
This transcript has been automatically generated and may not be 100% accurate.