US President Donald Trump warned Iranians to evacuate their capital in a social media post on Monday.

“Everyone should evacuate Tehran immediately!,” the president wrote in Verdad Social, without saying why.

Israel has been bombing Iran since early Friday morning, and the two nations have launched an escalating back-and-forth attack on each other.

In his post, Trump repeated his claim that Iran should have accepted a deal that would curb its nuclear ambitions.

“Iran should have signed the ‘deal’ I told them to sign. What a shame and what a waste of human life. Simply put, IRAN CANNOT HAVE NUCLEAR WEAPONS,” he wrote. “I’ve said it time and time again!

Tehran is a city of almost 10 million inhabitants.

Earlier, after meeting with British Prime Minister Keir Starmer at the G7 summit, which runs until Tuesday in the Canadian town of Kananaskis, Trump said he is"in constant contact" with Israeli Prime Minister Benjamin Netanyahu and is talking "with everyone."

“I gave Iran 60 days, and they said no. And on day 61, we saw what happened,” he said, referring to the Israeli attack on Iranian nuclear, military, and scientific facilities that killed senior Iranian military officers and scientists.

"I think the agreement will be signed or something will happen, but an agreement will be signed," he insisted, going on to say that Iran"is basically at the negotiating table. They want to reach an agreement," despite the fact that the Israeli attack forced the suspension of a new round of negotiations between Washington and Tehran scheduled for Sunday.

The US president avoided the question of whether he wanted regime change in Iran.

“What I want is for Iran not to have nuclear weapons and we are on the way (to achieving that),” he commented.

Asked about imposing new sanctions on Russia, as the European Union (EU) wants, Trump was reluctant."We'll see; Europe hasn't done it yet," he explained.

"Sanctions cost the United States a lot of money. It's not that easy," he added, though he went on to assert that"money isn't the issue."

"Every week, 5,000 young people die, both Russians and Ukrainians. If we can stop it, I would be very happy," he said, after repeating his criticism of his predecessor, Joe Biden, for the"stupidity" of allowing Russia's invasion of Ukraine.