Deputies supported a draft bill "for the lifting of sanctions and protection of the Iranian people's interests", saying they wanted to achieve the objectives of "martyred" scientist Mohsen Fakhrizadeh.

Fakhrizadeh was assassinated on a major road outside Tehran on Friday in a bomb and gun attack that the Islamic republic has blamed on its arch foe Israel.

"The government has explicitly announced that it does not agree with (this) plan" which it considers "neither necessary nor useful", foreign ministry spokesman Saeed Khatibzadeh told a news conference Tuesday.

The draft bill calls on the government to end UN inspections of Iran's nuclear facilities and to "produce and store 120 kilogrammes per year of uranium enriched to 20 percent".

Such steps would run counter to commitments made by Iran as part of a landmark nuclear deal agreed with world powers in 2015.

The deal offers Iran relief from sanctions in exchange for curbs on its nuclear programme and UN-verified safeguards to prove it is not developing nuclear weapons.

The Islamic republic has always denied it is seeking such weaponry.

Seemingly in response to Israel's characterisation of Fakhrizadeh as the father of a secret nuclear weapons programme, Khatibzadeh said that the scientist had been "one of the main assistants behind the scenes in discussions" that led to the 2015 accord.

State news agency IRNA on Tuesday released undated pictures of Fakhrizadeh being awarded a medal by Iran's President Hassan Rouhani for his "contribution" to the Vienna agreement.

The multilateral accord has been hanging by a thread since 2018, when President Donald Trump unilaterally withdrew the United States and reimposed sanctions that have battered Iran's economy.

The Islamic republic has retaliated by gradually rolling back most of its commitments under the nuclear deal.

In its latest report last month, the International Atomic Energy Agency (IAEA) said Iran had enriched uranium over the 3.67 percent limit set out in the 2015 accord.

The UN's nuclear watchdog said that Iran had not exceeded the threshold of 4.5 percent and that the country was still complying with its strict inspections regime.

Speaking to reporters on Tuesday, Iran's government spokesman Ali Rabiei emphasised that the only institution mandated to make decisions on the country's nuclear programme was the Supreme National Security Council.

He also noted that any decisions made by that body require approval by supreme leader Ayatollah Ali Khamenei.

In an interview with AFP on Monday, IAEA chief Rafael Grossi said Iran had nothing to gain from ending inspections of its nuclear facilities.

"We understand the distress but at the same time it is clear that no-one, starting with Iran, would have anything to win from a decrease, limitation or interruption of the work we do together with them," Grossi said.