The funeral began on Saturday in Tehran with chants of "death to America, death to Israel," and his body is expected to be taken to Qom, Najaf and Kerbala, the great Shi'ite centers of Iran and Iraq.
A senior Iranian official said any deal would require the US to extend the current waiver given the shipping time between Japan and Iran.
Iran is staging a week of mass funeral processions for Khamenei, whose 37-year reign was brought to an end in February by the first airstrike of the war.
"The Israelis are undoubtedly seeking to disrupt the Iran-US MoU," Ghalibaf added, "but the deterrent power of the Islamic Republic of Iran in the region will prevent them from starting a war again."
The event will last a week and span several major cities in Iran and Iraq, with ceremonies in Tehran, Qom, Mashhad, Najaf, and Karbala.
Foreign officials attend Khamenei's funeral • Iranian general warns Israel, US against strikes • IDF reservist severely wounded in Lebanon
"A year and a half ago, we were laughed at. They’re not laughing anymore,” said the US president, who in the interview defended his decision to start a war with Iran that is now in its fourth month.
Iran's supreme leader was killed by US and Israeli strikes in their first attack of the war and the funeral events will begin over the weekend in Tehran, with mass processions planned next week.
Iran's Parliament Speaker Mohammad Bagher Ghalibaf told Iranians to "rise up" and "demand revenge" during a speech on Thursday at the funeral.
The centrist and nationalist KDPI is a historic Kurdish Iranian opposition group, which Iran has targeted for many years, assassinating its leaders decades ago.
Israel launches pilot program for returning Gaza residents, COGAT announces • US-Iran talks 'going well' Vance claims, Iran's deputy FM says monitoring of MoU discussed
