Trump told reporters on Thursday that he was not putting troops "anywhere," but that if he were to, he would not tell journalists.
The United States military is deploying thousands of additional Marines and sailors to the Middle East, three US officials told Reuters on Friday, as the US-Israeli war on Iran reached the three-week mark.
No decision had been made to send troops into Iran itself, the officials told Reuters, but they will build up the capacity for future operations in the region.
The deployments of the USS Boxer, along with its Marine Expeditionary Unit and accompanying warship, come as Reuters reported that US President Donald Trump's administration was considering deploying thousands of US troops to reinforce its operation in the Middle East.
Trump told reporters on Thursday that he was not putting troops "anywhere," but that if he were to do so, he would not tell journalists.
The sources, who spoke on the condition of anonymity, did not say what the role of the additional troops would be.
Troops departing US West Coast three weeks ahead of schedule, official says
One of the officials said the troops were departing the West Coast of the United States about three weeks ahead of schedule.
The White House and Pentagon did not immediately respond to a request for comment. The additional deployments will add to the 50,000 US troops already in the Middle East and would bring two Marine Expeditionary Units to the region.
The units, usually comprised of 2,500 Marines, can be used for a number of reasons, including carrying out strikes using the aircraft on board the ships or being deployed on land.
Sources had previously said the US military was preparing for possible next steps in its campaign against Iran, which began on February 28.
Those options, Reuters has reported, include securing the Strait of Hormuz, potentially by deploying US forces to Iran's shoreline.
The Strait is a waterway between the Persian Gulf and the Gulf of Oman on Iran’s southern coast, and is vital to the global oil trade and commercial shipping. Iran’s closure of the Strait following the start of the war has pushed oil prices above $100 per barrel.
The Trump administration has also discussed options to send ground forces to Iran's Kharg Island, the hub for 90% of Iran's oil exports.
Any use of US ground troops, even for a limited mission, could pose significant political risks for Trump, given low support among the American public for the Iran campaign and Trump's own pre-election promises to avoid entangling the US in new Middle East conflicts.
A Reuters/Ipsos poll that closed on Thursday found that some 65% of Americans believe Trump will order troops into a large-scale ground war in Iran, and just 7% support that idea.
Nevertheless, the US has continued to ramp up its strikes on Iranian regime targets. On Thursday, the Wall Street Journal reported that the US had been increasing its efforts to hit Iranian vessels in the Strait of Hormuz, which Trump has vowed to open "one way or another."
