Iran sanctions evoke great passion in Washington. Although Obama sees the economic pressure as the key motivation for bringing Iran's new moderate President Hassan Rouhani to the negotiating table, pulling them back is the administration's only real carrot for securing nuclear concessions.
Congress, which passed the sanctions, is leery. Israel sees any letup on the economic pressure as a dangerous concession that allows Iran to move even closer to nuclear weapons capability. And the powerful American Israel Public Affairs Committee has joined the call, saying new sanctions are needed "so that Iran will face immediate consequences should it renege on its commitments or refuse to negotiate an acceptable final agreement."
Menendez and Kirk hope to have their bill ready for other lawmakers to consider when the Senate returns Dec. 9 from its two-week recess, according to legislative aides.
The measure would require the administration to certify every 30 days that Iran is adhering to the terms of the six-month interim agreement and that it hasn't been involved in any act of terrorism against the United States.
Without that certification, sanctions worth more than $1 billion a month would be re-imposed and new sanctions would be added. The new penalties would include bans on investing in Iran's engineering, mining and construction industries and a global boycott of Iranian oil by 2015. Foreign companies and banks violating the sanctions would be barred from doing business in the United States.
The senators want to send the bill to the president before the end of the year, said the aides, who spoke on condition of anonymity because they weren't authorized to speak by name on the matter. White House officials wouldn't say if Obama might veto such legislation.
Kerry, whose message sought to push back against what he called "misinformation," spoke privately by telephone with Menendez in an effort to sway him, officials said. The secretary of state warned of dire consequences.
"Passing any new sanctions legislation during the course of the negotiations, in our view, would be unhelpful," State Department spokeswoman Jen Psaki said.
"Other countries would think that the United States is not living up to our end of the bargain in terms of giving the negotiations a chance," she said. "And it could have the opposite impact of what is intended by driving the Iranians to take a harder line in these negotiations in response."
Psaki warned of new sanctions dividing the U.S. and its five negotiating partners Britain, China, France, Germany and Russia.
Sanctions are as much about securing international cooperation as drafting tough laws. If major commercial powers that maintain business with Iran such as China or Japan, for example, decide to ignore the new restrictions, the Obama administration would have relatively few enforcement options. Shutting Chinese or Japanese banks out of the U.S. market isn't realistic because of the economic impact such a step would entail.