Secretary of State John Kerry is urging congressional opponents of an emerging nuclear deal with Iran to "hold their fire" until they see a final agreement later this year.

Kerry says he will brief lawmakers over the next two days as part of the Obama administration's effort to beat back a move among lawmakers to require congressional approval to ease sanctions on Iran.

Kerry tells CBS' "Face the Nation" that the administration should be free to negotiate without interference until the June 30 deadline for a final agreement.

On Tuesday, the Senate Foreign Relations Committee is expected to debate a bill that would give Congress a say on any deal. Republicans are trying to erect obstacles to a deal, while Democrats are aiming to give negotiators more leeway.

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