Crude oil retreated slightly from its highest level in six months.
Brent crude traded below US$116 per barrel after gaining more than 6% last week, while West Texas Intermediate hovered near US$102 per barrel.
Donald Trump told Fox News that whether to reach a deal with Tehran or "finish the whole thing off" would soon require a decision.
Washington recently ordered an expansion of evacuations of diplomatic personnel across the Middle East.
A person familiar with Tehran's thinking said Iran is preparing to face a fresh wave of strikes around the US midterm elections on November 3 and is ready to retaliate, with targets including Israel and the United Arab Emirates.
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