US President Donald Trump has issued an ultimatum to Iran, warning that Tehran faces its last chance to avoid a decapitation of its nuclear program.

Talking to reporters from the White House on Monday, Trump said the Strait of Hormuz must be open 'literally by tomorrow, completely open'. His comments came after recent weeks of escalating tensions between the US and Iran, with Tehran continuing to breach nuclear limits set by the 2015 JCPOA deal.

Trump's statement was echoed by a string of other US officials, who reiterated that the window for Iran to strike a new nuclear deal is rapidly closing.

'We're talking about the Strait, the opening of the Strait, having it open literally by tomorrow, completely open,' Trump told reporters.

The US has imposed a raft of sanctions on Iran in recent months, targeting its oil exports and key infrastructure. These measures are intended to curb Tehran's nuclear ambitions, but have so far failed to deliver the desired results.

Tehran has consistently maintained that its nuclear program is for peaceful purposes, but the international community remains deeply concerned about the country's military intentions.

Iran has repeatedly breached the limits set by the JCPOA, including the number of centrifuges it can operate and the amount of enriched uranium it can store.

As tensions continue to escalate, the world waits with bated breath for Tehran's response to Trump's ultimatum.