(WASHINGTON) — Defense Secretary Pete Hegseth on Monday defended the ongoing U.S. attack on Iran as necessary because of Tehran’s missile arsenal and nuclear ambitions, calling it “our retribution” for its yearslong role in sponsoring terrorism.

Hegseth declined to say how long the operation would last or rule out the potential of sending U.S. troops on the ground.

“We didn’t start this war, but under President Trump, we are finishing it. Their war on Americans has become our retribution against their Ayatollah and his death cult,” Hegseth said.

Hegseth’s press conference was his first since the large-scale operation began two days ago. The attack resulted in the death of Iran’s supreme leader and some of its senior leadership.

President Donald Trump in recent days told reporters he expect the operation could last four to five weeks — a timeline Hegseth wouldn’t commit to.

Four U.S. service members have died, with several more severely wounded, according to U.S. Central Command. 

Gen. Dan Caine, chairman of the Joint Chiefs of Staff, who also briefed reporters on Monday, said the U.S. is sending additional forces into the region, primarily aviation assets.

“We expect to take additional losses and, as always, we will work to minimize U.S. losses,” Caine said, later adding, “this is major combat operations.”

When pressed on the missions objectives, Hegseth insisted the goals were clear. 

“The mission of Operation Epic Fury is laser-focused,” Hegseth said. “Destroy Iranian offensive missiles, destroy Iranian missile production, destroy their navy and other security infrastructure, and they will never have nuclear weapons. We’re hitting them surgically, overwhelmingly and unapologetically.”

Critics of the administration have questioned the timing of the operation though because of U.S. intelligence that has found the threat from Iran was not imminent. According to the Defense Intelligence Agency, Iran is working on developing a missile capable of reaching the U.S. by 2035.

The U.S. also bombed three of Iran’s nuclear sites last year. Experts say there are recent signs of Iran trying to rebuild its program and begin again enriching uranium, but that there was no evidence they were close to building a bomb. 

Trump said over the weekend that a preemptive attack on Iran was justified by “imminent threats” from the Iranian guard, though he provided no evidence, and to topple the Iranian regime.

Hegseth said Monday that Iran was “stalling” during recent negotiations with U.S. officials to buy time to build up its ballistic missile program and restart its nuclear ambitions.

“Their goal: hold us hostage, threatening to strike our forces. Well, President Trump doesn’t play those games,” Hegseth said.

Iran has responded with a massive attack on U.S. allies across the Middle East, targeting Israel, regional U.S. bases and Gulf nations. Four U.S. service members have been killed, which Hegseth said occurred when Iran hit a tactical operations center that had been fortified.

The attack resulted in the death of Iran’s supreme leader and some of its senior leadership.

In a phone call with ABC News Chief Washington Correspondent Jonathan Karl, Trump said the “attack was so successful it knocked out most of the candidates” to lead Iran.

Hegseth, though, on Monday said the operation was not a “so-called regime-change war.”

“Turns out the regime who chanted ‘death to America’ and ‘death to Israel’ was gifted death from America and death from Israel. This is not a so-called regime-change war, but the regime sure did change, and the world is better off for it,” Hegseth said.

The defense secretary rejected that the U.S. would be involved in another “forever war” in the region, though he gave little detail on what comes next.

Hegseth declined to give a timeline on how long the military operation could last, after Trump told ABC News the attacks could last four or five more weeks.

“President Trump has all the latitude in the world to talk about how long it may or may not take. Four weeks, two weeks, six weeks. It could move up, it could move back. We’re going to execute at his command the objectives we’ve set out to achieve,” Hegseth said.

ABC News’ Alexandra Hutzler contributed to this report.

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(WASHINGTON) — An Iranian plot to kill then-candidate Donald Trump was clearly on the president’s mind when he ordered the attack that killed Iran’s supreme leader.

“I got him before he got me,” Trump Sunday night, not long after he announced Ayatollah Ali Khamenei had been killed. “They tried twice. Well, I got him first.”

President Trump was referring to an Iranian plot to kill him during the 2024 presidential campaign. During the summer of 2024, U.S. intelligence believed the Iranian government was plotting to kill then-candidate Trump.

The plot was not tied to the assassination attempts against the candidate in Butler, Pennsylvania, or West Palm Beach, Florida, but Trump was briefed on the threat and additional resources were added by the Biden administration to his Secret Service detail.

When I spoke with President Trump late Sunday night after he had returned to the White House from a weekend overseeing military operations in Iran from his club in Mar-a-Lago, he sounded like a president who is feeling invincible.

He said he believes the military operation has been an unmitigated success.

“Nobody else could have done this but me, and you know that,” Trump told me.

Trump told me the Iranians had made significant concessions in the last round of talks. He suggested his decision to cut off talks those and order the attack was driven in part by the success of the military operations to capture Venezuelan leader Nicolas Maduro, whom the U.S. said was an illegitimately elected president , and to strike the Iranian nuclear facilities last summer in coordination with Israel.

“A year ago, it would have been great to accept that deal for me,” he said on Sunday, “but we have become spoiled.”

Trump told me that someone in the Iranian government reached out to him, but he would not say who.

“I probably shouldn’t tell you,” he said. “One of the few remaining people who are still alive. He doesn’t report to the Supreme Leader anymore.”

Before the attacks, the administration had identified possible leaders of a post-Khamenei Iran, but Trump said they are all gone. Khamenei was killed on Saturday alongside around 40 senior Iranian officials, the Israel Defense Forces said.

“The attack was so successful it knocked out most of the candidates,” Trump said. “It’s not going to be anybody that we were thinking of because they are all dead. Second or third place is dead.”

When asked about his statement earlier in the day that there would be more American casualties.

“It’s war and you have casualties in war,” he said.

Trump marveled at the level of American losses so far, pointing to last summer’s attack and the operation against Maduro in Venezuela as evidence of his administration’s military precision.

“All the things we went through and we lost three people. We lost three,” he said. “But if you ask Iran how many they lost, they can’t count that high.”

U.S. Central Command on Monday said another member of the U.S. military had been killed during the operation against Iran, bringing the total known U.S. deaths to four people. At least 555 people have been killed in Iran in U.S.-Israeli strikes, the Iranian Red Crescent Society said in a statement on Monday.

When asked on Sunday how long the war would go on, Trump said, “We always thought it was a four-to-five-week deal.”

Was he prepared to go longer?

“Sure. We have a lot of ammunition,” he said. “It could also go less.”

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