Support for the international nuclear agreement with Iran is growing in the U.S. Congress as two more Democratic senators have said they will support the pact.
Bob Casey and Chris Coons, who have been known as Iran hard-liners, both said on September 1 they backed the international agreement.
Their support means that 33 members of the Senate -- 31 Democrats and two independents -- now support the deal, which was announced on July 14 between the United States, five other world powers and Tehran.
Two Senate Democrats have said they would vote against the deal, along with the overwhelming majority of Republicans in the chamber.
Backers of the agreement will need 34 votes in the Senate to sustain President Barack Obama's veto if a Republican-sponsored resolution of disapproval passes both the Senate and House of Representatives.