U.S. President Donald Trump on Sunday raised the question of regime change in Iran following U.S. strikes against key military sites over the weekend, as senior officials in his administration warned Tehran against retaliation.

"It’s not politically correct to use the term, “Regime Change,” but if the current Iranian Regime is unable to MAKE IRAN GREAT AGAIN, why wouldn’t there be a Regime change??? MIGA!!!" Trump wrote on his social media platform.

Trump's post came after officials in his administration, including U.S. Vice President JD Vance and Defense Secretary Pete Hegseth, stressed they were not working to overthrow Iran's government.

"This mission was not and has not been about regime change," Hegseth told reporters at the Pentagon, calling the mission "a precision operation" targeting Iran's nuclear program.

Vance, in an interview on NBC's "Meet the Press with Kristen Welker," said "our view has been very clear that we don't want a regime change."

"We do not want to protract this or build this out any more than it's already been built out. We want to end their nuclear program, and then we want to talk to the Iranians about a long-term settlement here," Vance said, adding the U.S. "had no interest in boots on the ground."

"Operation Midnight Hammer" was known only to a small number of people in Washington and at the U.S. military's headquarters for Middle East operations in Tampa, Florida.

Shamkhani, adviser to Iran's Supreme Leader Ali Khamenei, writing on social media platform X that "Even assuming the complete destruction of (nuclear) sites, the game is not over."

Complete with deception, seven B-2 bombers flew for 18 hours from the United States into Iran to drop 14 bunker-buster bombs, chairman of the Joint Chiefs of Staff, General Dan Caine, told reporters.

In total, the U.S. launched 75 precision-guided munitions, including more than two dozen Tomahawk missiles, and more than 125 military aircraft in the operation against three nuclear sites, Caine said.

The operation pushes the Middle East to the brink of a major new conflagration in a region already aflame for more than 20 months with wars in Gaza and Lebanon, and a toppled dictator in Syria.

DAMAGE TO FACILITIES

With the damage visible from space after 30,000-pound U.S. bunker-buster bombs crashed into the mountain above Iran's Fordow nuclear site, experts and officials are closely watching how far the strikes might have set back Iran's nuclear ambitions.

Caine said initial battle damage assessments indicated all three sites sustained extremely severe damage and destruction, but he declined to speculate whether any Iranian nuclear capabilities might still be intact.

U.N. nuclear watchdog chief Rafael Grossi was more cautious, saying while it was clear U.S. airstrikes hit Iran's enrichment site at Fordow, it was not yet possible to assess the damage done underground.

A senior Iranian source told Reuters on Sunday that most of the highly enriched uranium at Fordow, the site producing the bulk of Iran's uranium refined to up to 60 percent, had been moved to an undisclosed location before the U.S. attack.

Vance told NBC the U.S. was not at war with Iran but rather its nuclear program, and he thought the strikes "really pushed their program back by a very long time."

Trump called the damage "monumental," in a separate social media post on Sunday, a day after saying he had "obliterated" Iran's main nuclear sites, but gave no details.

Tehran has vowed to defend itself and responded with a volley of missiles at Israel that wounded scores of people and destroyed buildings in its commercial hub Tel Aviv.

But, perhaps in an effort to avert all-out war with the superpower, it had yet to carry out its main threats of retaliation, to target U.S. bases or choke off the quarter of the world's oil shipments that pass through its waters.

Caine said the U.S. military had increased protection of troops in the region, including in Iraq and Syria.

The United States already has a sizeable force in the Middle East, with nearly 40,000 troops in the region, including air defense systems, fighter aircraft and warships that can detect and shoot down enemy missiles.

Reuters reported last week the Pentagon had started to move some aircraft and ships from bases in the Middle East that may be vulnerable to any potential Iranian attack.

NOT OPEN-ENDED

With his unprecedented decision to bomb Iran’s nuclear sites, directly joining Israel’s air attack on its regional arch foe, Trump has done something he had long vowed to avoid - intervene militarily in a major foreign war.

There were sporadic anti-war demonstrations on Sunday afternoon in some U.S. cities, including New York City and Washington.

It was unclear why Trump chose to act on Saturday.

At the press conference, Hegseth said there was a moment in time when Trump "realized that it had to be a certain action taken in order to minimize the threat to us and our troops."

After Trump disputed her original assessment, Director of National Intelligence Tulsi Gabbard on Friday said the U.S. had intelligence that should Iran decide to do so, it could build a nuclear weapon in weeks or months, an assessment disputed by some lawmakers and independent experts. U.S. officials say they do not believe Iran had decided to make a bomb.

U.S. Secretary of State Marco Rubio, asked on CBS' "Face the Nation with Margaret Brennan" whether the U.S. saw intelligence that Iran's Supreme Leader Ayatollah Ali Khamenei had ordered nuclear weaponization, said: "That's irrelevant."

Hegseth, who said the Pentagon notified lawmakers about the operation after U.S. aircraft were out of Iran, said the strikes against Iran were not open-ended.

Rubio also said no more strikes were planned, unless Iran responded, telling CBS: "We have other targets we can hit, but we achieved our objective. There are no planned military operations right now against Iran - unless they mess around."

(Reuters)

'Why wouldn't there be Regime change?' Trump doubts, Iran says 'game not over'