Obama Warns Iran on Nuclear Plans at UN

President Obama delivers message at United Nations.
3:00 | 09/25/12

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Transcript for Obama Warns Iran on Nuclear Plans at UN
Thank you, david. What about the man who will face the governor, the president? He was making a case today but before a world audience of allies and adversaries at the united nation. He gave a passionate tribute to the u.S. Ambassador killed in libya and called on the world to make a stand against extreme is. Here's jake tapper. Reporter: The president made the focus of his united nations speech about a man who wasn't there. I would like to begin today by telling you about an american named chris stevens. Reporter: With a tribute to a u.S. Ambassador to libya, attacked and killed in the dead of night in beghazi two weeks ago today. Today -- extolling the humanity and hope stevens stood for. If we are serious about those ideals, we must speak honestly about the deeper causes of the crisis. Today, we must affirm that our future will be determined by people like chris stevens, and not by his killers. Reporter: But, in many ways, targeted at his domestic audience -- accused by republicans of glibly down playing the unrest in the muslim world, the president demanded an end to the violence. There is no speech that justifies the mindless violence. There are no words that excuse the killing of innocents. Reporter: And while only days ago, the white house was asking youtube to review whether that anti-muslim film violated the terms of use -- today the president offered a full throated defense of freedom of speech. Like me, the majority of americans are christian, and yet we do not ban blasphemy against our most sacred beliefs. Reporter: That was followed by a call to stop those who fan the flames against the west and its allies. T is time to marginalize those that hate the west or israel as central politics. Reporter: A smaller part of today's speech -- iran's nuclear program, a continued source of frustration and tension. Despite efforts, at both outreach and tough sanctions that country has more than doubled its production rate of enriched uranium since obama took office. The united states will do what we must to prevent iran from obtaining a nuclear weapon. Reporter: Last year's meeting president obama met separately with more than a dozen world leaders. This year he had no such meetings scheduled prompting criticize mg he's more focused on campaigning than governing. Hillary clinton met with 20 world leaders in his place.

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

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