"After that, and the selection of a GREAT & ACCEPTABLE Leader(s), we, and many of our wonderful and very brave allies and partners, will work tirelessly to bring Iran back from the brink of destruction," Trump said in a social media post, adding that they would work to boost Iran's economy.
Trump signed off the post with "MAKE IRAN GREAT AGAIN (MIGA!)," a riff on his longtime campaign slogan "Make America Great Again".
White House press secretary Karoline Leavitt was asked on Friday what Trump meant by "unconditional surrender".
"What the president means is that when he, as commander in chief of the US Armed Forces, determines that Iran no longer poses a threat to the United States of America, and the goals of Operation Epic Fury has been fully realised, then Iran will essentially be in a place of unconditional surrender, whether they say it themselves or not," Leavitt said.
The United States is well on its way toward controlling Iranian airspace, Leavitt said, adding that the US expects the achievable objectives to be completed in four to six weeks.
Speaking to reporters at the White House, Leavitt also said the administration was looking at potential candidates to lead Iran, a day after Trump told Reuters the United States should play a role in helping choose a replacement for supreme leader Ayatollah Ali Khamenei, killed in the war's first day.
"I know there's a number of people that our intelligence agencies and the United States government are looking at but I won't get any further on that," Leavitt said.
Trump's post on social media came just hours after Iran's president announced that unspecified countries had begun mediation efforts in one of the first signals of any diplomatic initiative to end the conflict.
President Masoud Pezeshkian posted on X: "Some countries have begun mediation efforts."
He did not identify the countries or provide further details.
"Let's be clear: we are committed to lasting peace in the region, but we have not the slightest hesitation in defending the dignity and authority of our country. Mediation should address those who underestimated the Iranian people and ignited this conflict," he added.
Under Iran's system, the president is subordinate to the supreme leader, but Pezeshkian is now serving on a panel that has assumed Khamenei's duties.
Israel pounded the Lebanese capital Beirut on Friday after ordering an unprecedented evacuation of the entire southern suburbs of the city.
It also launched a new wave of attacks on Iran, saying 50 of its warplanes had struck a bunker beneath the destroyed Tehran compound of Khamenei, still being used by Iran's leadership after he was killed.
The United States will respond to Iranian attacks on civilians throughout the Middle East, US Central Command leader Brad Cooper said on Friday.
Cooper said that Iran has attacked 12 different countries since the US and Israel launched strikes on Iran last week, including firing seven attack drones at residential neighbourhoods in Bahrain on Thursday night.
"This is unacceptable and will not go unanswered," Cooper said in a statement.
Trump on Friday also said the United States was moving thousands of people out of various countries throughout the Middle East.
"It is being done quietly, but seamlessly," Trump said in a social media post without providing further details.
The State Department said later on Friday that it was continuing to reach out to US citizens in the Middle East to offer charter flights or ground transport travel assistance.
with AP
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