The US naval base in Guantanamo Bay, Cuba, already houses a migrant facility - separate from the high-security US prison for foreign terrorism suspects - that has been used on occasion for decades, including to house Haitians and Cubans picked up at sea.
But a move to house tens of thousands of migrants at the base would again widen the Pentagon's role in Trump's crackdown on illegal immigration.
Donald Trump says Guantanamo Bay will detain the worst criminal illegal aliens threatening America. (AP PHOTO)
"Today I'm also signing an executive order to instruct the Departments of Defence and Homeland Security to begin preparing the 30,000 person migrant facility at Guantanamo Bay," Trump said at the White House on Wednesday.
He said the facility would be used to "detain the worst criminal illegal aliens threatening the American people. Some of them are so bad we don't even trust the countries to hold them because we don't want them coming back, so we're going to send them out to Guantanamo. This will double our capacity immediately, right? And, tough."
The Pentagon did not immediately respond to a request for comment, but it is likely that personnel from DHS will be responsible for the migrants themselves.
It is unclear how the facility would be funded.
The detention facility at Guantanamo Bay was set up in 2002 by then-president George W Bush to detain foreign militant suspects following the September 11, 2001, attacks on the United States. There are 15 detainees left in the prison.
But the facility for migrants is separate from the detention centre on the base.
Pro-refugee groups have called for the Guantanamo migrant facility to be closed and for Congress to investigate alleged abuses there.
The International Refugee Assistance Project said in a 2024 report that detainees described unsanitary conditions, families with young children housed together with single adults, a lack of access to confidential phone calls, and the absence of educational services for children.
On Tuesday, the US military said that it would allow Immigration and Customs Enforcement to detain migrants at Buckley Space Force Base in Colorado.
The decision comes on top of US military deportation flights of migrants out of the country and the deployment of just over 1600 active-duty troops to the US border with Mexico following Trump's emergency declaration on immigration last week.Â
Meanwhile, Trump will sign the Laken Riley Act into law as his administration's first piece of legislation.
People who are in the US illegally and are accused of theft and violent crimes would have to be detained and potentially deported even before a conviction.
The measure quickly passed the new Republican-controlled Congress with some Democratic support even though immigrants rights advocates said it possibly could lead to large round-ups of people for offences as minor as shoplifting.
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