Senators Bob Casey and Chris Coons, known as Iran hard-liners,
both said they backed the agreement announced on July 14 between the
United States, five other world powers and Tehran.
Altogether 31 Senate Democrats and two independents who vote with
them now support the deal, a potential legacy foreign policy
achievement for Democratic President Barack Obama.
Backers will need 34 votes in the Senate or 146 in the House of
Representatives to sustain Obama's veto if a Republican-sponsored
resolution of disapproval passes both chambers.
Both Casey and Coons said they had had serious questions about the
agreement, but decided it was the best option for limiting Iran's
nuclear program and preferable to the United States breaking from
the other countries that signed the deal.
"I was never persuaded by arguments that we could ... renegotiate
successfully and get a result," Casey told Reuters in a telephone
interview.
"I will support this agreement because it puts us on a known path of
limiting Iran's nuclear program for the next 15 years with the full
support of the international community," Coons said in a speech at
the University of Delaware.
Supporters hope they will gather the 41 votes to block a disapproval
resolution in the Senate and keep Obama from having to use his veto
power. Congress has until Sept. 17 to pass a resolution.
Two Senate Democrats oppose the nuclear deal, along with an
overwhelming majority of Republicans.
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Several House Democrats announced support for the deal on Tuesday,
including Adam Smith, the top Democrat on the House Armed Services
Committee. More than 90 House members, all Democrats, now back the
deal.
A two-thirds majority in each chamber is required to override a
presidential veto and torpedo a pact in which Tehran agreed to
curtail its nuclear program in exchange for relief from economic
sanctions.
Some pro-Israel groups echoed Israeli Prime Minister Benjamin
Netanyahu's insistence that the agreement would threaten Israel's
existence by empowering Iran.
Casey said he had heard "a lot of passionate arguments" from both
sides but that, despite reservations, he concluded that the
agreement, with a strong deterrence policy, was the best way to keep
Iran from building a bomb.
(Reporting by Patricia Zengerle; Editing by Dan Grebler and Howard
Goller)
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