The president’s comments come after the Israel Defense Forces (IDF) attacked multiple nuclear facilities and military targets on Iranian soil early Friday morning.

Tehran responded by sending out 100 drones, many of which were intercepted by Israel, and by launching dozens of missiles late Friday that were also blocked.

Earlier, the US had denied involvement in the offensive.

Talks between the United States and Iran to reach a deal were set to enter their sixth round on Sunday.

Trump told Truth Social that he had given Tehran “opportunity after opportunity.”

“There has already been great death and destruction, but there is still time to end this massacre, with the next attacks already planned even more brutal,” he said.

“Iran must come to an agreement, before there is nothing left, and save what was once known as the Iranian Empire. No more death, no more destruction, just do it before it is too late!” he added.

Trump previously claimed he was aware of Israel’s plans before they launched the overnight strikes, but made clear that the US military was not involved in the operation.

Asked about the extent of this, Trump replied: “It wasn’t a heads-up. It was that we knew what was going on.”

He also called the operation “a very successful attack, to put it mildly.”

“A unilateral action”

Following Israel’s attack, US Secretary of State Marco Rubio issued a statement reiterating that his administration had no involvement in the offensive.

“Let’s be clear: Iran must not attack US interests or personnel,” he said.

Trump’s opposition

BBC White House correspondent Bernd Debusmann Jr. explains that before the bombing began, the US president indicated that he did not want to see any Israeli attack on Iran.

“As long as I believe there can be a deal, I don’t want to see it happen,” he said, adding that any offensive could derail the ongoing negotiations.

However, he cautioned that he believed an attack was “pretty close.”

“I don’t want to say it’s imminent,” he said of a possible Israeli attack. “But it looks like something that could very well happen.”

Referring to Iran, Trump said that “they will have to be willing to give us some things they are not willing to give us right now.”

“The United States had received advance warning about Israel’s attack on Iran. The Trump administration’s swift action to protect US personnel in the region was testament to that,” writes Anthony Zurcher, BBC North America correspondent.

“It’s also quite clear that US officials are not happy about this development,” he adds.

“Their cool response so far to the Israeli action, notable for its emphasis on the lack of US involvement in planning or support, underlines this.”

The White House may have been caught off guard by the swiftness of the attack

Jake Kwon, BBC North America correspondent

Since news broke that some US personnel were evacuated from Baghdad following confirmation that Israel was “fully ready” to attack Iran, local media have been closely monitoring the Trump administration for clues as to when such an attack might take place.

Some speculated that the evacuation was simply a tactic to pressure the Iranians into the next round of talks on Sunday, and that the Israelis would wait to see if an agreement could be reached first.

Trump told reporters he wants to avoid conflict and that an Israeli attack would derail negotiations.

This all suggests the White House was likely also surprised by the speed with which the attack occurred.

Click here to read more stories from BBC News.

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