U.S. Senate Democrats have rallied the 34 votes they need to keep the Iran nuclear deal alive in Congress, handing President Barack Obama a major foreign-policy victory.
Senator Barbara Mikulski became the crucial 34th vote on September 2, declaring the agreement the best way to curb Iran's nuclear ambitions.
Congress is to vote later this month on a resolution disapproving the deal, which is unanimously opposed by Republicans, who call it a dangerous giveaway to Iran.
Obama has vowed to veto the resolution if it passes. It would take 34 votes in the 100-member Senate to uphold his veto, and Democrats now have those votes.
The agreement -- signed by Iran, the United States and five other world powers -- limits Iran's nuclear program in exchange for hundreds of billions of dollars in relief from sanctions.
Even if Congress were able to pass the disapproval resolution, it can't stop the deal.
In July, the UN Security Council unanimously endorsed the nuclear deal, approving a resolution that would lift the international sanctions on Iran in 90 days.