Three more U.S. Democratic senators have announced their support for the nuclear agreement with Iran.
With the support, US President Barack Obama now has 41 Senators confirming their support.
This will be enough to ensure a resolution opposed to the deal won't make it through a procedural hurdle in Congress, meaning Obama won't have to use his veto power to kill it.
Obama already had enough support among Senate lawmakers to ensure his veto of any initial rejection would not be overturned, but had been hoping not to have to use it, as it would send a signal to Iran and the world that the US is united behind the agreement.
Members of Congress, who have returned from their summer recess, have until September 17th to review the deal reached in July.
Democratic Senate Minority Leader Harry Reid says he believes the plan the 'best pathway to peace.'
"Today, I am gratified to say to my fellow Americans, our negotiating partners and our allies all around the world, this agreement will stand. America will uphold its commitment and seize this opportunity to stop Iran from getting a nuclear weapon."
Opponents in Congress are accusing the Obama administration of giving too many dangerous concessions to Iran.
Senate Majority Leader Mitch McConnell is among those who plan to oppose the bill.
"All that such political statements really say is that the administration lacks the will and the leadership to pursue a stronger agreement, additional sanctions and policies intended to end Iran's enrichment program if it cannot attain Congressional agreement on the President's deal with Iran."
The deal was struck in July between Iran and the five permanent members of the UN Security Council, plus Germany.
It's due to be implemented in November, provided all countries involved sign off on the accord.
The deal aims to limit Iran's nuclear program in exchange for hundreds of billions of dollars in relief from international sanctions.
