WASHINGTON—The Trump administration is considering a significant expansion of the U.S. military footprint in the Middle East, including dozens more ships, other military hardware and as many as 14,000 additional troops to counter Iran, U.S. officials said.

The deployment could double the number of U.S. military personnel who have been sent to the region since the start of a troop buildup in May. President Trump is expected to make a decision on the new deployments as soon as this month, those officials said.

Mr. Trump, facing an election next year, has long sought to exit foreign entanglements and avoid new conflicts. But on Iran—and partly at the behest of Israel—he is convinced of the need to counter the threat his aides say Tehran poses, the officials said. He also could approve a smaller U.S. deployment, the officials said.

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