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			 Obama made his case in a nationally televised news conference 
			responding to critics at home and abroad after Iran and six world 
			powers sealed an accord in Vienna on Tuesday to restrict Tehran’s 
			nuclear program in exchange for sanctions relief. 
			 
			"Without a deal,” Obama said, “there would be no limits to Iran’s 
			nuclear program and Iran could move closer to a nuclear bomb ... 
			Without a deal, we risk even more war in the Middle East.” 
			 
			Obama, who must still overcome a congressional hurdle to enact the 
			accord, said that if the United States does not seize the 
			opportunity, “future generations will judge us harshly.” 
			 
			The agreement is a triumph for Obama, who has made outreach to 
			America’s enemies a hallmark of his presidency, but it is also seen 
			as his biggest foreign policy gamble since taking office in 2009. 
			 
			In his first public comment, Iran's Supreme Leader, Ayatollah Ali 
			Khamenei, said the deal should be scrutinized and legal procedures 
			taken so the other side does not breach it. 
			 
			In a letter to Iranian President Hassan Rouhani, Khamenei - whose 
			ultimate backing was critical to securing the agreement - said some 
			of the powers involved in the negotiations "are not trustworthy." 
			
			  Obama is now spearheading an intense White House push to counter 
			Republican critics in Congress and reassure jittery allies such as 
			Israel and Saudi Arabia. 
			 
			He sent Vice President Joe Biden to Capitol Hill on Wednesday to 
			corral fellow Democrats who might be wavering. Defense Secretary Ash 
			Carter will travel next week to Israel and Saudi Arabia. 
			 
			Critics say the deal contains loopholes, especially in inspection 
			procedures that Iran could exploit, and will provide Tehran with an 
			infusion of unfrozen assets to fund its proxies in sectarian 
			conflicts from Syria to Iraq to Yemen. 
			 
			LAWYERLY APPROACH 
			 
			At Wednesday's news conference, Obama spoke in a lawyerly tone, at 
			times mocking opponents of the deal, including Israeli Prime 
			Minister Benjamin Netanyahu, for offering no viable alternative. He 
			dismissed critics' objections one by one and even solicited others 
			from journalists. 
			 
			Obama contended the deal was sound and that a "snap-back" mechanism 
			in it to restore sanctions if Iran cheated would ensure Tehran faced 
			real consequences. 
			 
			But he acknowledged that although he hopes the deal will encourage 
			Iran to rein in its aggressive conduct in the region, he was not 
			betting on a change. 
			 
			Obama said without a deal other countries in the Middle East would 
			feel compelled to pursue their own nuclear arms programs. 
			 
			"There really are only two alternatives here," he said, citing 
			diplomacy or war, an appeal to war-weary Americans to back a 
			negotiated settlement with Iran. 
			 
			Under the agreement, sanctions imposed by the United States, the 
			European Union and the United Nations will be lifted in return for 
			Iran agreeing long-term curbs on a nuclear program that the West has 
			suspected was aimed at creating a nuclear bomb. Iran says the 
			program is peaceful. 
			 
			
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			Obama has run into a storm of accusations from Republican lawmakers 
			and Israel that he gave away too much to Tehran. 
			
			Obama has vowed to veto any effort to block the deal and although he 
			faces a tough challenge in the Republican-controlled Congress, he is 
			expected to prevail. 
			
			He said he does not anticipate Republicans in Congress will rally 
			around the pact but said that if lawmakers vote based on the facts, 
			the majority should approve it. 
			 
			The agreement, the biggest step toward rapprochement between Iran 
			and the West since the 1979 Islamic Revolution, is a legacy-defining 
			achievement for Obama as well as his best hope for salvaging an 
			otherwise shaky Middle East record. 
			 
			Netanyahu cried foul, however, convinced the deal will do little to 
			curb Tehran's nuclear ambitions and leave Israel under greater 
			threat. 
			 
			His nuclear affairs minister said Israel was like the boy in the 
			fairy tale who pointed out the emperor had no clothes, and 
			emphasized Israel's right to unilateral self-defense. 
			 
			“Israel is like the little child that is pointing its finger and 
			saying, 'the king is naked, this agreement is naked'," said Yuval 
			Steinitz. 
			 
			Obama said Israel, widely assumed to be the Middle East's only 
			nuclear-armed state, had legitimate security concerns but insisted 
			that danger would be compounded if Iran acquired a nuclear weapon. 
			 
			Obama's national security adviser, Susan Rice, told Reuters 
			Washington would look at ways to deepen its security cooperation 
			with Israel. 
			 
			"We will ... be looking forward, if the Israelis are interested and 
			willing - they haven't said so yet - to discuss with them how we 
			might further deepen and strengthen our security and intelligence 
			cooperation," she said. 
			 
			Congress will have 60 days to review the agreement. Republicans 
			would need the support of dozens of Democrats to sustain a 
			"resolution of disapproval" that could cripple a deal. But the odds 
			are slim that they could muster enough support to overrule an Obama 
			veto. 
			
			
			  
			
			(Reporting by Matt Spetalnick and Roberta Rampton; Additional 
			reporting by Jeff Mason, Lisa Lambert and Patricia Zengerle in 
			Washington, Bozorgmehr Sharafedin Nouri in Dubai and Luke Baker in 
			Jerusalem; Editing by James Dalgleish and Ken Wills) 
			
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