Trump also delayed a deadline for Iran to open the Strait of Hormuz for shipping or see its power stations targeted by airstrikes, briefly driving down oil prices and boosting stocks.

The delay offered a reprieve after the US and Iran traded threats over the weekend of strikes that could have cut electricity to millions in Iran and around the Gulf and knocked out desalination plants that provide many desert nations with drinking water, while raising fears of possible catastrophe if nuclear plants were hit.

But any information on the talks described by Trump remain in dispute with Iran, which denied any talks had been held.

"No negotiations have been held with the US," Iranian parliament Speaker Mohammad Bagher Qalibaf posted on X. "Fakenews is used to manipulate the financial and oil markets," he added.

Israeli Prime Minister Benjamin Netanyahu said Israel will continue to strike Iran and Lebanon even as the US considers a ceasefire. "There's more to come," he said.