IRAN’S foreign minister has warned of a tough response from Tehran if President Donald Trump presses ahead with his threats to scuttle the landmark 2015 nuclear deal.

The country’s top diplomat, Mohammad Javad Zarif, briefed politicians during a closed session of parliament on Trump’s anticipated refusal to certify Iran’s nuclear deal with world powers.

Zarif said, if the United States acts against the deal, Iran will offer a “tougher response”.

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Trump is expected to decline this week to certify Iran’s compliance in the 2015 agreement, referring it to Congress.

He also is expected to target the country’s paramilitary Revolutionary with new sanctions.

Later yesterday, Iranian president Hassan Rouhani told a Cabinet meeting Mr Trump’s speech will make clear “which is the rebellious government, and which is the side that violates international rules”.

If the US backs out of the nuclear deal, “it won’t be our failure at all, but a failure for the other side”, Rouhani said.

In Britain, Prime Minister Theresa May urged the United States to extend the nuclear deal, saying it is “vitally important for regional security”. China, France, Russia, Germany, Britain and the European Union all ratified the deal.