Historic nuclear deal iran
EU defends Iran deal despite Trump, appeals to US Congress
Donald Trump, meanwhile, renewed his criticism of the accord and raised the possibility he might try to end it completely.
Under the July 14 agreement, Iran is to curb its nuclear programme under United Nations supervision.
An historic nuclear agreement will see sanctions lifted on Iran
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Obama said the historic deal was the only alternative to a nuclear arms race and more war in the Middle East.
US President Barack Obama hailed the deal as a step towards a "more hopeful world".
Map showing Iran's nuclear facilities
The deal grants Tehran sanctions relief in exchange for curbs on its nuclear programme.