President Hassan Rouhani says on Sunday Iran has plans to respond to any move by US President Donald Trump on the 2015 nuclear agreement and the United States would regret a decision to exit the accord.

Critics of the upcoming accord have pointed out that Iran will not play by the rules and may continue a covert programme for uranium enrichment outside designated nuclear facilities covered under the agreement.

Bridging the gap between Iran and the West would help soften Iran's present voice against Israel through a possible political and social transformation in favour of the West.

The only thing to lament about the agreement reached by Iran and the P5+1 (the UN Security Council's five permanent members – China, Britain, France, Russia, and the United States – plus Germany) in Vienna this month is that it was not signed and sealed a decade ago.

The US Congress has 60 days to review the agreement. During that time, President Obama cannot lift the sanctions.

Rouhani and his allies are unable to offer ordinary Iranians economic hope – a failure that causes them to lose both the legislative and presidential elections.

After the marathon 18-day Vienna talks a historic deal was signed on Tuesday between Iran and six global powers -- the US, Russia, China, Britain, France and Germany.