1. ITV Report

Donald Trump set to abandon nuclear deal with Iran

Trump is expected to overturn the deal negotiated by Barack Obama. Credit: AP

Donald Trump is set to abandon a landmark nuclear deal with Iran.

In a speech later, the US president is expected to say it is "not in America's national security interests".

Under US law, Mr Trump faces a Sunday deadline to notify Congress whether Iran is complying with the accord that was painstakingly negotiated over 18 months by the Obama administration and determine if it remains a national security priority.

Although Mr Trump intends to say Iran is living up to the letter of the agreement, he will make the case that the deal is fatally flawed and that its non-nuclear behaviour violates the spirit of the regional stability it was intended to encourage, the officials and advisers said.

The officials and advisers, who insisted on anonymity because they were not authorised to publicly preview the speech, said Trump will not call for a re-imposition of nuclear sanctions on Tehran.

He will urge lawmakers to codify tough new requirements for Tehran to continue to benefit from the sanctions relief that it won in exchange for curbing its atomic program.

And he will announce his long-anticipated intent to impose sanctions on Iran's Revolutionary Guard Corps by designating it a terrorist organisation under an existing executive order, according to the officials and advisers.

Secretary of State Rex Tillerson has been consulting with counterparts in Europe and China. Credit: AP

In addition, Mr Trump will ask Congress to amend or replace outright the legislation that currently requires him to certify Iranian compliance every 90 days.

Officials have said that Mr Trump hates the requirement more than the nuclear deal itself because it forces him to take a position every three months on what he has denounced as the "worst deal in American history".

Secretary of State Rex Tillerson was calling foreign minister colleagues from the other parties to the deal to brief them on what to expect, the State Department said.

American allies, who have pressed the White House to remain in the nuclear accord, will be closely watching the president's address.

Trump wants to impress on the European parties to the accord - Germany, France and Britain - the importance of fixing what he sees as flaws in the nuclear accord and addressing malign behaviour not covered in the agreement.

The Europeans, along with the other parties, Iran, Russia and China, have ruled out reopening the deal.

But some, notably France, have signalled a willingness to tackle unresolved issues in supplementary negotiations.