Reuters first reported on March 18 that Trump's administration was considering deploying thousands of additional US troops, a move that would expand options to include deployment of forces inside Iranian territory. Such an escalation could dramatically raise the stakes in the conflict, which is already in its fourth week and has roiled global markets.

The 82nd Airborne Division can deploy anywhere in the world within 18 hours and specializes in "forcible entry parachute assaults" that clear the way for follow-on military action, according to its website.

The New York Times was the first to report on Monday that senior military officials were weighing a possible deployment of a combat brigade from the 82nd Airborne and some of its planning and logistics staff to the ongoing US-Israel war against Iran.

Those soldiers or members of the 31st Marine Expeditionary Unit already en route "could be used to seize Kharg Island," Iran's oil export hub, the Times said.

The officials, speaking on the condition of anonymity, did not specify where in the Middle East the troops would go or when they would arrive in the region. The soldiers are stationed at Fort Bragg, North Carolina. 

The US military referred questions to the White House, which said all announcements on troop deployments would come from the Pentagon.

"As we have said, President Trump always has all military options at his disposal," White House spokeswoman Anna ​Kelly said.

No decision had been made to send troops into Iran itself, one of the sources told Reuters, but they will build up capacity for potential future operations in the region.

One of the sources said the Pentagon was set to send between 3,000 and 4,000 soldiers. 

The soldiers' deployment follows Reuters' March 20 report about the US decision to send thousands of Marines and sailors aboard the USS Boxer, an amphibious assault ship, along with its Marine Expeditionary Unit and accompanying warships to the Middle East. 

Prior to the additional forces being sent to the region, there were 50,000 US troops there. News of reinforcements comes just a day after Trump postponed threats to bomb Iranian power plants, saying there had been "productive" talks with Iran. 

But after Trump's Truth Social comment on Monday, Iran denied that any talks had been held.

The US has carried out ⁠strikes against ​9,000 targets inside Iran since US and Israeli military operations against Iran started on February 28.

Thirteen US troops have been killed so far in the war and 290 have been wounded, a US official said. While 10 remain seriously wounded, 255 troops have returned to duty. 

Sources had previously said the US military was looking at options in the Iran war including securing the Strait of ​Hormuz, potentially by deploying US ⁠forces to Iran's shoreline.

The Trump administration has also discussed options to send ground forces to Iran's Kharg Island, the hub for 90 percent of Iran's oil exports, Reuters has reported.

Any use of US ground troops - even for ​a limited mission - could pose significant political risks for Trump, given low American ​public support 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 published on Tuesday found that 35 percent of Americans approve of the US strikes on Iran, down from 37 percent in a survey conducted last week. Some 61 percent disapproved of the strikes, compared to 59 percent last week.

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