US President Barack Obama has defended the conclusion of nuclear negotiations between the P5+1 group of countries and Iran.
The opportunity of concluding the nuclear talks "may not come again in our lifetime," he told reporters in Washington on Wednesday.
"With this deal we cut off every single one of Iran's pathways" to nuclear weapons, Obama said.
"And Iran's nuclear program will be under severe limits for many years. Without a deal, those pathways remain open."
“When deal is implemented, we will know we have dismantled immediate concerns around Iran's nuclear program,” Obama said.
He added this is the “most vigorous inspection and verification regime by far that has ever been negotiated.”
He made the comments one day after Iran and the P5+1 group of countries -- the US, Britain, France, China, Russia and Germany -- reached a conclusion on the Joint Comprehensive Plan of Action (JCPOA) in the Austrian capital of Vienna.
The US president also expressed hope that the evaluation of the recent agreement by Congress should be "based on the facts, not on politics."
He said the American lawmakers should consider the national interests of the country.
The US Congress now has 60 days to review the text of the Joint Comprehensive Plan of Action and vote to either approve or disapprove of the text.
Obama had earlier said that he would veto any legislation from lawmakers that "prevents the successful implementation of the deal."