UNITED NATIONS, Sept. 13 -- With an hour-long slide show that blends satellite imagery with disquieting assumptions about Iran's nuclear energy program, Bush administration officials have been trying to convince allies that Tehran is on a fast track toward nuclear weapons.
The PowerPoint briefing, titled "A History of Concealment and Deception," has been presented to diplomats from more than a dozen countries. Several diplomats said the presentation, intended to win allies for increasing pressure on the Iranian government, dismisses ambiguities in the evidence about Iran's intentions and omits alternative explanations under debate among intelligence analysts.
The presenters argue that the evidence leads solidly to a conclusion that Iran's nuclear program is aimed at producing weapons, according to diplomats who have attended the briefings and U.S. officials who helped to assemble the slide show. But even U.S. intelligence estimates acknowledge that other possibilities are plausible, though unverified.
The problem, acknowledged one U.S. official, is that the evidence is not definitive. Briefers "say you can't draw any other conclusion, and of course you can draw other conclusions," said the official, who would discuss the closed-door sessions only on condition of anonymity.
The briefings were conducted in Vienna over the past month in advance of a gathering of world leaders this week at the United Nations. President Bush, who is to address the annual General Assembly gathering Wednesday, and Secretary of State Condoleezza Rice, plan to use the meeting to press for agreement to threaten international sanctions against Iran.
The president's direct involvement marks an escalation of a two-year effort to bring Iran before the U.N. Security Council, which has the power to impose sanctions, unless Tehran gives up technology capable of enriching uranium for a bomb. U.S. officials have acknowledged that it has been an uphill campaign, with opposition from key allies who fear a prelude to a military campaign.
Several diplomats said the slide show reminded them of the flawed presentation on Iraq's weapons programs made by then-secretary of state Colin L. Powell to the U.N. Security Council in February 2003. "I don't think they'll lose any support, but it isn't going to win anyone either," said one European diplomat who attended the recent briefing and whose country backs the U.S. position on Iran.
Robert G. Joseph, undersecretary of state for arms control and international security, acknowledged last week that despite European support, the Bush administration has traveled a tough road in persuading others that Iran should face consequences for a nuclear program it built in secret.
"There's a great deal of resistance . . . on the part of many governments who don't seem to place, quite frankly, nonproliferation and Iran, a nuclear-armed Iran, at the top of their priority list," he told a congressional panel last week.