U.S. State Department official Wendy Sherman. Photo: State Department.

CBS News – The Obama administration’s chief nuclear negotiator refused Tuesday to provide a hard deadline for a deal with Iran to prevent it from developing nuclear weapons. She vowed to consult with Congress before suspending more economic sanctions on Tehran, but said the administration won’t necessarily seek lawmakers’ approval.

The testimony by the State Department’s Wendy Sherman immediately prompted objections in the Senate Foreign Relations Committee, whose Democratic and Republican members pushed for clear markers as part of the diplomatic effort. World powers and Iran recently committed to a four-month negotiating extension through Nov. 24, an agreement that allows the Islamic republic to recoup $2.8 billion in Iranian assets frozen in overseas bank accounts.

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