Iran on Sunday rejected the United States' response to its proposal for reopening the Strait of Hormuz, describing it as insufficient and demanding further clarification on unresolved conditions.

Iranian security chief and Secretary of the Supreme National Security Council Mohsen Rezaei told state media that Tehran presented seven conditions during the UN General Assembly under which the strategic waterway could reopen to normal maritime traffic within seven days. The United States replied through Qatari intermediaries, accepting some demands while leaving others unclear.

"We presented seven conditions to the Americans and clearly stated that the Strait of Hormuz would not be opened to them, and no negotiations would take place, until these conditions are met," Rezaei said. He added that Iran is "no longer in the process of responding to the Americans."

The rejection comes amid an ongoing conflict that began in late February with US and Israeli strikes on Iran. The Strait of Hormuz, which handled about one-fifth of global oil and liquefied natural gas shipments before the war, remains closed to US vessels under Iran's terms.

Rezaei noted that Washington must address the ambiguities before any progress. Iranian officials have linked the conditions to a June memorandum of understanding tied to a temporary ceasefire that later collapsed.

US President Donald Trump previously rejected aspects of Iran's earlier offers, including demands for sanctions relief and access to frozen assets ahead of nuclear discussions. Washington has insisted on addressing Iran's nuclear program as part of any broader agreement.

The impasse prolongs uncertainty over energy markets and highlights Tehran's strategy of conditioning any de-escalation on its full list of demands. Iranian Parliament Speaker Mohammad Bagher Ghalibaf has reiterated that the strait stays closed until the conditions are fulfilled.

No immediate White House response was available following Rezaei's remarks. Mediators including Qatar and Pakistan continue to relay messages between the sides.