Iran called the United States, wanting "very badly" to make a deal, US President Donald Trump claimed to reporters at the White House on Monday.
Trump said he didn't want to comment on what would happen if a deal wasn't reached by the end of the ongoing ceasefire, but that "it won't be pleasant for them, let me put it that way."
Trump also said that Iran had refused to agree to having a nuclear weapon and that the US would get the nuclear material back.
"We can't let a country blackmail or extort the world," Trump said.
Vice President JD Vance had done a "very good job" on Iran, the president added.
Trump also threatened that the US might also visit Cuba after finishing with Iran.
Trump threatens Iranian ships in Strait of Hormuz
Trump warned that any Iranian vessels attempting to come close to the US's blockade of the Strait of Hormuz will be "immediately ELIMINATED," in a post to Truth Social on Monday.
"Iran's Navy is laying at the bottom of the sea, completely obliterated - 158 ships," Trump said.
"What we have not hit are their small number of, what they call, 'fast attack ships,' because we did not consider them much of a threat," he continued.
James Genn contributed to this report.