"He indicated that new sanctions should not be enacted during the current negotiations, but that they would be most effective as a robust response should Iran not accept the P5Ư proposal or should Iran fail to follow through on its commitments."
Both Vice President Joseph Biden and Secretary of State John Kerry went to Capitol Hill last week to lobby for delayed sanctions.
Iran is set to resume negotiations in Geneva, Switzerland, Wednesday with Britain, China, France, Russia, the US plus Germany, known as the P5Ư, after intensive talks there Nov 7-9 failed to produce a deal.
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