"I have to be back early for obvious reasons," US President Donald Trump told reporters as he left the G7 summit in Canada a day early.
His exit came as Israel and Iran attacked each other for a fifth consecutive day.
Reports circulated that Trump had instructed the White House National Security Council to meet upon his return.
The White House was at pains to emphasise that the president had "a great day" at the summit, saying much was accomplished, including a trade deal between the US and UK.
It means the US president will miss in-person meetings with Ukrainian President Volodymyr Zelensky and Mexican President Claudia Sheinbaum that were scheduled for Tuesday, the final day of the summit.
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