UNDATED (CNN) -- Iran's president takes the stage at the UN General Assembly today, but he may not have much of an audience. Some world leaders are expected to walk out in protest when Mahmoud Ahmadinejad speaks.
With his final term winding down, this will likely be Mahmoud Ahmadinejad's last UN speech as Iranian president. And he's in the spotlight even before taking the podium.
President obama told the general assembly on Tuesday that Iran has failed, time and again, to demonstrate its nuclear program is peaceful and meet its UN obligations. The president says, "America wants to resolve this issue through diplomacy and we believe there is still time and space to do so. But that time is not unlimited. Make no mistake; a nuclear-armed Iran is a challenge that can be contained."
On the campaign trail, Republican rival Mitt Romney said the president's approach to Iran has not worked. He says, "Words are words. You need to show the kind of action that suggests to them that we're serious about what we're saying."
Former President Bill Clinton told CNN's "Piers Morgan Tonight" he doesn't believe Iran's nuclear program is only for peaceful purposes, as the country insists.
And in an interview that aired earlier this week, Ahmadinejad reflected on his upcoming speech. He says, "I have been coming to the United Nations General Assembly for eight years now, seeking progress and friendly relations with all nations, and the objective is still the same."
Representatives of various countries have walked out in protest during Ahmadinejad's previous speeches. In addition to Iran's president, Egypt's newly elected president will also speak at the UN General Assembly today.