"The crucial point is that a consortium is not an alternative and cannot replace uranium enrichment in the country," Esmaeil Baghaei said, according to the Tasnim news agency.
He declined to comment on whether this demand was included in the latest proposal made by the United States to Iran. Unconfirmed reports suggest the US demanded a complete halt to Iranian uranium enrichment in a written proposal to Tehran.
In return, Washington is said to have offered the country the civilian use of nuclear technology, including uranium enrichment, within the framework of a regional consortium under the supervision of the International Atomic Energy Agency.
Baghaei said Iran will give an appropriate response to the US proposal in due course.
Until then, the country will insist on both its own uranium enrichment and the lifting of US sanctions in the next round of negotiations, he said.
After five rounds of talks between Iranian Foreign Minister Abbas Araqchi and President Donald Trump's Middle East envoy Steve Witkoff to resolve the nuclear standoff, many issues remain unresolved.
Among clashing red lines is Iran's rejection of a US demand that Tehran commit to scrapping uranium enrichment, viewed as a potential pathway to developing nuclear bombs.
Tehran says it wants to master nuclear technology for peaceful purposes and has long denied accusations by Western powers that it is seeking to develop nuclear weapons.
Tehran demands the immediate removal of all US-imposed curbs that impair its oil-based economy. But for the US, the removal of nuclear-related sanctions should be done in phases.
Dozens of Iranian institutions vital to Iran's economy, including its central bank and national oil company, have been sanctioned since 2018 for, according to Washington, "supporting terrorism or weapons proliferation".
Trump's revival of a "maximum pressure" campaign against Tehran since his return to the White House in January has included tightened sanctions and threats to bomb Iran if current negotiations yield no deal.
During his first term, Trump in 2018 ditched Tehran's 2015 nuclear pact with six powers and reimposed sanctions that have crippled Iran's economy. In return, Tehran has rapidly violated the 2015 nuclear pact's curbs on its nuclear program.
The 2015 deal required Iran to take steps to restrict its nuclear program in return for relief from US, EU and UN economic sanctions.
with DPA
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