US President Donald Trump was leaving a Group of Seven summit early on Monday as he hinted of greater involvement in the Israel-Iran conflict after issuing an ominous warning for the capital Tehran to evacuate.

After a day of speaking with G7 leaders at a Canada summit about the need for a negotiated deal, Trump took to social media to back Israel and issue a warning to Tehran, a city of nearly 10 million people.

"Everyone should immediately evacuate Tehran!" Trump wrote on his Truth Social platform.

Shortly afterward, White House Press Secretary Karoline Leavitt said that Trump would return to Washington late Monday due to the crisis, a day earlier than planned.

Trump will miss a day of meetings in the Rockies resort of Kananaskis that was also expected to include meetings with the leaders of Ukraine and Mexico.

Trump has repeatedly declined to say if the United States would participate in Israeli military action, although he says it was not involved in initial strikes.

He told reporters before his decision was announced to leave early: "As soon as I leave here, we're going to be doing something. But I have to leave here."

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