Secretary of State John F. Kerry flies to Switzerland on Sunday for the next round of talks over Iran's nuclear program, amid soaring expectations that a historic agreement is imminent.
A cascade of signals from Washington and Tehran suggests the governments taking part in the talks believe they can reach a framework for a deal by late March despite domestic opposition.
Some critics of the emerging deal say they fear Iran will be left with a large nuclear program and its bomb-making capability intact.
"The entire deal is a bet on verification," said Mark Dubowitz, an Iran expert who is executive director of the Foundation for Defense of Democracies. "And I'm deeply skeptical that the sanctions relief structure we're putting in place, which is highly dependent on snapback sanctions, is at all workable. I fear over time we will lose our economic leverage to enforce Iranian compliance."
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