Even while negotiators argue over the number of centrifuges Iran would be allowed to spin and where inspectors could roam, the Iranians have signaled that they would accept, at least temporarily, a “suspension” of the stringent sanctions that have drastically cut their oil revenues and terminated their banking relationships with the West, according to American and Iranian officials. The Treasury Department, in a detailed study it declined to make public, has concluded Mr. Obama has the authority to suspend the vast majority of those sanctions without seeking a vote by Congress, officials say.
But Mr. Obama cannot permanently terminate those sanctions. Only Congress can take that step. And even if Democrats held on to the Senate next month, Mr. Obama’s advisers have concluded they would probably lose such a vote.
“We wouldn’t seek congressional legislation in any comprehensive agreement for years,” one senior official said.
White House officials say Congress should not be surprised by this plan. They point to testimony earlier this year when top negotiators argued that the best way to assure that Iran complies with its obligations is a step-by-step suspension of sanctions — with the implicit understanding that the president could turn them back on as fast as he turned them off.
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