In his first public remarks since the outline agreement was announced last week, the spy agency chief said yesterday's deal would impose a litany of restrictions on Iran's nuclear work that had once seemed impossible to secure.
"I must tell you the individuals who say this deal provides a pathway for Iran to a bomb are being wholly disingenuous, in my view, if they know the facts, understand what's required for a (nuclear) program," Brennan told an audience at Harvard University.
The accord would mean "cutting off pathways not just to uranium enrichment but to plutonium enrichment" and include a "very intrusive inspection regime," Brennan said.
"I certainly am pleasantly surprised that the Iranians have agreed to so much here.
"In terms of the inspections regime, the reduction as far as the centrifuges, the stockpile, what they're doing with the Arak reactor -- all of that I think is really quite surprising and quite good."
Some critics were less focused on Iran's nuclear program and more on the effect of lifting sanctions, as they worry it will allow Tehran to "cause more trouble throughout the area," Brennan said.
That was a legitimate concern, he said. But the framework deal itself offered a way of curtailing any attempt by Iran to build nuclear weapons and is "as solid as you can get," he said.
US and allied intelligence agencies would be closely monitoring how Iran implemented any deal and there was no expectation that Tehran would alter its stance in the region, he said.
"I think we'll see. But I don't think this is going to lead to a light switch when all of a sudden the Iranians are going to become passive, docile in the region, no.
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