Oregon's Democratic Senator Jeff Merkley on Sunday announced his support for the Iran nuclear deal.
This puts the number of supporters of the deal at 31, just three short of the 34 needed to make sure that if Congress passes a resolution of disapproval against the deal and President Barack Obama vetoes it, the veto cannot be overridden by Congress.
Merkley acknowledged that the deal has "significant shortcomings.”
"Because of these shortcomings, many have argued that the United States, instead of implementing the agreement, should withdraw from it, persuade our partners to set the agreement aside and work together to negotiate a better deal," Merkley said in a statement.
"However, the prospects for this are slim. All of our partners … believe that the current deal – in regard to its central goal of blocking Iran's pathways to a nuclear bomb – is sound. They have committed the good faith of their governments behind the agreement and intend to honor the deal as long as Iran does likewise, with or without the United States."