What Would Happen If the U.S. Attacked Iran?

ABC's Jonathan Karl asks President Obama about Iranian promise to retaliate if U.S., Israel strike.
6:30 | 03/22/13

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Transcript for What Would Happen If the U.S. Attacked Iran?
-- -- -- -- that you have said repeatedly on this trip and before that. All options are on the table to stop Iran from getting a nuclear weapon including. Military action. Yesterday the supreme leader of Iran came out -- if any action is taken against his country he won't raise the city's. It is -- -- Tel Aviv and Haifa to the ground so my question to you is. Are you prepared. To deal with the retaliation. The fallout that would calm after a military strike against Iran's nuclear facilities. And some two King Abdullah might ask what you think. What happened here what would be the aftermath of a military strike -- taken by the United States or by Israel against Iran what is -- a bigger threat. To -- to stability in this region Iran with nuclear weapons or another war. In this region. We're the first -- and I'm -- and he isn't always hypotheticals. Because. What I've said. From the moment I came in office. Was the best resolution. Of this situation is. Through diplomacy. And I continue to believe that. We have organized. The international community around us sanctions regime that is having an impact on -- -- Not because we forced other countries to do it because they recognize that if you trigger a nuclear arms race in this region. As volatile as it is. If you have the prospect of nuclear weapons getting in the hands. Terrorists and extremists. That it's not just Israel that -- It's a whole range of people that could be threatened. We're talking right now possibility of series using. Chemical weapons. Won't be the conversation. If Syria possesses nuclear weapons. So this so this is not just. Problem for Israel was not just a problem for the United States. It's a regional and worldwide -- and by the way. We have been consistent in saying that nonproliferation. Is a problem around the global. Not justice -- respect to -- But the fact of the matter is is that Iran has not been able to establish. Credibly with the international community had in fact it is simply pursuing peaceful nuclear power. There's a reason why it's subject to all his. Resolutions. And violations. Identified by the United Nations. That's not something we made up. There -- a lot of other countries who have the technical capacity but for some reason they are able to get right with the international community. Iran has not been able to do something. Now. If in fact. What the supreme leader has said it is the case which is that. Developing a nuclear weapon would be un Islamic. And that. Iran has no interest. In developing nuclear weapons. That there should be a practical. Verifiable way. To assure the international community that it's not doing so. At this problem will be solved. To the benefit of the region and to the benefit of the Iranian people. Out there on a -- celebrating -- rules. The most important -- Fans and -- your regular road nor -- message. And I would. Reminder. There are a great civilization. They have an extraordinary history they have unbelievable talent. They should be fully. International community that -- and build business and expand commerce. And there should be exchanges and travel and interactions. We'll be right -- people. And everyone else including the United States. That should be the -- Not threats. Raise. Israeli cities to the ground. A part of part of the frustration that I think we all feel sometimes -- That it seems is that people spend all their time organizing around -- They can gain advantage over other people or inflict violence some other people. Isolate other people -- still don't try to figure out how -- way to solve problems this is a solvable problem. If in fact -- not pursuing underprivileged and so work on our continued to apply the pressure that we have. And they nonmilitary ways to try to resolve -- problem. We will continue -- try to pursue diplomatic solutions to the situation. But guess I have served as president of United States. That. I will maintain every option. That's available. To -- that. Iran from getting a nuclear weapon because I think the consequences. For the region. And for the world. Would be extraordinarily dangerous hired him. My whole. An expectation is -- Among a menu of options. The option that involves. Negotiations discussions. Compromise. And resolution. Of the problem. Is the one that's exercise but as president six. I would never take. -- -- -- There's -- great problem that I would like that what the president said I think looking provision in point of view. The challenges that Jordan faces as we look around of the region. The challenges of what the Israelis and the Palestinians and will be facing 2012. Instability is you're seeing in Syria and we have -- -- what's happening in Iraq any military action the moment whether. Israeli reunion. To me at this stage is this pandora's box because nobody can guarantee what the outcome will be. So hopefully there is -- another way of resolving this problem. At a time was so much instability in the -- we just don't need another thing Marshall.

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

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