President Donald Trump faces potentially the hardest choice of his time in the White House, as he weighs up whether the United States should join Israel's bombing campaign against Iran.

Trump fueled speculation about a US intervention as he dashed back from a G7 summit in Canada, warning Tuesday that the United States could kill Iran's supreme leader, but would not "for now."

The choice is a monumental one for a president who has vowed throughout both his first and second terms in the Oval Office to get the United States out of its "forever wars" in the Middle East.

"It's a major political and military choice that could define his legacy in the Middle East," Behnam Ben Taleblu, director of the Iran program at the Foundation for Defense of Democracies, told AFP.

As Trump met his National Security Council in the White House Situation Room on Tuesday, there were already hints that he was considering abandoning what was until........

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