President Donald Trump has threatened to annihilate Iran’s entire civilian infrastructure within hours if nuclear negotiations fail, issuing the ultimatum from the Oval Office on Monday.

“We’re going to win one way or the other,” Trump told reporters during an event launching his administration’s “Trump Accounts” initiative. “We’re going to make a deal or we’re going to finish the job, okay. And it won’t be tough to finish the job.”

The president offered a granular description of potential U.S. military targets. “I’d rather make a deal, because I don’t want to affect 91 million people,” he said. “We can knock down their bridges in one hour. We can knock out their energy supply.”

He then specified the timeline for a full-scale assault on Iran’s power sector. “We can knock out their electricity and power-generating plants, and I would say in a small part of an afternoon, every plant will be gone,” Trump said from the Oval Office on July 6. “And they know that.”

The threats land as indirect U.S.-Iran talks concluded the previous week without public progress. Both sides agreed to pause negotiations for the week of funeral ceremonies for the late Supreme Leader Ayatollah Ali Khamenei, who was killed in joint U.S.-Israeli air strikes on February 28. As of July 7, the talks remain on hold.

Iran’s top national security official responded with defiance hours after Trump’s remarks. Mohammad Baqer Zolqadr, Secretary of Iran’s Supreme National Security Council, dismissed the president’s warning as baseless. “Trump’s threats are delusional and illusory,” Zolqadr said in an official statement. “Iranians are unfamiliar with the language of threats and will respond in another language.”

Trump, who was taking unscheduled questions from reporters rather than delivering a prepared address, reiterated his preference for a diplomatic resolution. “There’ll be no nuclear weapon,” he said. “We’re going to be getting the, as I call it, dust; the enriched material—nuclear dust.”

In an earlier interview with Axios, the president clarified he was not pursuing regime change, saying Iranian leaders remained necessary counterparts. “They are all there. One shot and we can take them all out, but we are not going to do that because then we would have nobody to negotiate with.”

The Iranian Embassy in Armenia also condemned Trump’s language in a social media post, asserting the United States “neither has a civilisation, history, nor honour” to comprehend Iran’s mourning for Khamenei.

“We’re going to win one way or the other,” Trump said. “We’re going to make a deal or we’re going to finish the job.”