Secretary of State John Kerry is urging congressional opponents of the emerging nuclear deal with Iran to "hold their fire" until they see a final agreement in two months.
"The whole purpose of the sanctions was to have a negotiation; now we're having that negotiation and I think we've earned the right through what we've achieved in the interim agreement," Kerry said.
Since reaching a framework agreement on April 2, the Obama administration has repeatedly urged the Senate to refrain from voting on legislation requiring congressional approval to lift sanctions against Iran. The president promised to veto any such bill.
Meanwhile, Kerry said he will brief lawmakers over the next two days as part of the administration's effort to beat back the move for congressional approval to lift sanctions on the Islamic Republic.
"We've earned the right to be able to try and complete this without interference and certainly without partisan politics," Kerry told CBN's "Face the Nation."
Iranian President Hassan Rouhani, meanwhile, said Iran will not sign any agreement that doesn't immediately lift all existing sanctions.
The bill, co-sponsored by Sen. Bob Corker, R-Tenn., and Sen. Bob Menendez, D-N.J., would allow Congress to weigh in on sanctions.
June 30 is the deadline for a final agreement.