Davos: Iran warned the US Congress on Friday against imposing new sanctions, saying this would lead to a collapse of negotiations over Iran`s controversial nuclear programme.
"We have an agreement that has the prospect of reaching a comprehensive agreement," Iran`s Foreign Minister Mohammad Javad Zarif told a meeting of political and business leaders in Davos.
"If someone comes to torpedo (the agreement), I believe (the person or entity) should be isolated by the international community, whether it`s the US Congress or anybody else.
"Now is the time for the international community to stand firm against (the threat of new sanctions)that will unravel an extremely important achievement."
Any new sanctions passed by the US Congress can be vetoed by President Barack Obama, but Zarif warned that if Iran`s president does not have similar powers over parliament.
"In our constitution, our president does not have the power to veto parliament (which has) threatened publicly" to take retaliatory action against any move by Congress.
"They will adopt something requiring the government... to increase our (uranium) enrichment," said Zarif.
Iran and major world powers secured an interim accord in November 2013 offering Tehran partial sanctions relief, in exchange for a freeze by Iran of contentious parts of its nuclear activities.
Since then the parties have missed two deadlines for a final deal, and a third deadline is looming on July 1. Iran denies Western accusations that it wants to build a nuclear weapon, saying its program is purely civilian.