For many years, we have worked together on a bipartisan basis to stop Iran's pursuit of a nuclear weapons capability. It was the Senate that passed the toughest sanctions in history over this administration's strong objections – sanctions the President now credits with bringing Iran to the negotiating table. Just last May, the Senate voted 99-0 to reiterate "that the policy of the United States is to prevent Iran from acquiring a nuclear weapon capability and to take such action as may be necessary to implement this policy."

Now we have come to a crossroads. Will the Senate allow Iran to keep its illicit nuclear infrastructure in place, rebuild its teetering economy and ultimately develop nuclear weapons at some point in the future – or will the Senate stand firm on behalf of the American people and insist that any final agreement with Iran must dismantle the regime's illicit nuclear infrastructure and preclude the world's foremost state sponsor of terrorism from ever producing nuclear weapons? The answer to this question will be determined by whether you allow a vote on S. 1881, the bipartisan Nuclear Weapon Free Iran Act, which is cosponsored by more than half of the Senate.