Iran's latest response to a US plan is "totally unacceptable," US President Donald Trump said on Sunday.

"I have just read the response from Iran's so-called 'Representatives.' I don't like it – TOTALLY UNACCEPTABLE!" Trump wrote on his Truth Social, without elaborating.

Iran's response to the latest US proposed text for ending the war was sent on Sunday to mediator Pakistan, Iran's official news agency IRNA reported.

According to Iran's semi-official Tasnim News Agency, Tehran's response "highlights the need to immediately end the war, provide guarantees for the non-repetition of the aggression against Iran, and certain other issues within a political agreement."

It also demands a 30-day window for rescinding US sanctions on Iranian oil sales and the release of Iran's frozen assets following the preliminary agreement, Tasnim reported.

The news agency cited a source as saying Trump's rejection "doesn't matter at all."

"No one in Iran writes proposals to please Trump," the source said, adding that Iran's negotiating team drafts plans solely based on "the rights of the Iranian people," according to Tasnim.

The peace proposal the US had presented a week ago reportedly consists a brief 14-point memorandum designed to halt hostilities, restore shipping through the Strait of Hormuz and pave the way for broader negotiations over Tehran's nuclear program. 

US Secretary of State Marco Rubio has said Iran needs to "make it clear" that they do not seek a nuclear weapon, which Washington sees as crucial to a peace deal.

(With input from agencies)