Mossad chief '100 per cent certain' Iran seeks nuclear bomb

The head of Israel's Mossad intelligence agency is "100 per cent certain" that Iran remains committed to developing a nuclear bomb and believes the international community must change or scrap its nuclear deal with the Islamic Republic.

The comments by Yossi Cohen added an influential voice to a global debate over Iran's nuclear program ahead of a deadline set by President Donald Trump for toughening the deal. Trump, like Israeli Prime Minister Benjamin Netanyahu, has been a fierce critic of the 2015 nuclear deal.

Trump has set a mid-May deadline to reach agreement with the European nations to toughen restrictions on Iran, including by extending the limitations on nuclear activity that are currently set to expire under the deal in several years.

If the US and the Europeans can't agree on new punishments that are to Trump's liking, he will withdraw from the deal and re-impose US sanctions on Tehran, the White House has said.

With the clock ticking, Cohen has been holding discussions on the matter and delivered his assessment in a recent closed meeting with senior officials, according to a person who attended the meeting. Cohen's analysis signalled Israeli support for Trump's efforts.

Cohen called the nuclear deal a "terrible mistake," saying it allows Iran to keep key elements of its nuclear program intact and will remove other restraints in a few years.

"Then Iran will be able to enrich enough uranium for an arsenal of nuclear bombs," Cohen said, according to the meeting participant, who spoke on condition of anonymity because he was discussing a classified security matter.

Cohen also criticised the deal's easing of sanctions, saying it has resulted in "significantly increased" aggression by Iran, and noted Iran's continued development of long-range ballistic missiles.

"As head of the Mossad, I am 100 per cent certain that Iran has never abandoned its military nuclear vision for a single instant. This deal enables Iran to achieve that vision," Cohen said. "That is why I believe the deal must be completely changed or scrapped. The failure to do so would be a grave threat to Israel's security."