Trump administration offers unaccompanied migrant children $US2,500 to voluntarily leave the US

The Trump administration is offering unaccompanied migrant children $US2,500 ($3,800) to leave the US voluntarily, according to a letter seen by Reuters that was sent to migrant shelters.

Officials at the Department of Homeland Security's Immigration and Customs Enforcement (ICE) confirmed a monetary offer was being made but did not specify an amount.

The letter was sent to shelters by the Department of Homeland Security's Office of Refugee Resettlement, on Friday.

US President Donald Trump has launched an immigration crackdown since returning to the White House in January. (AP: Moises Castillo)

The letter stated the department will provide a "one-time resettlement support stipend of $US2,500" to unaccompanied children 14 or older.

An ICE official said the offer was first being made to 17 year olds.

Minors from Mexico are not eligible for the program but children who had already volunteered to leave the US as of Friday would be covered, the letter says.

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The move is the latest financial offer made by the Department of Homeland Security (DHS) under President Donald Trump aimed at encouraging voluntary deportations.

In June, the State Department moved $US250 million to the DHS for voluntary deportations with the administration offering a $US1,000 stipend to migrants who "self deported".

Children need protection not coercion, critic says

Wendy Young, president of Kids in Need of Defence, which provides legal services and support to unaccompanied children, called the move "a cruel tactic" that undermined "laws that guarantee" a process to determine if a child is eligible for US protection.

"Unaccompanied children seeking safety in the United States deserve our protection rather than being coerced into agreeing to return back to the very conditions that placed their lives and safety at risk," Ms Young said in a statement.

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According to federal law, migrant children who arrive at US borders without a parent or legal guardian are classified as unaccompanied and sent to federal government-run shelters until they can be placed with a family member or in foster care.

More than 2,100 unaccompanied children were in the custody of the Department of Health and Human Services (HHS) as of Thursday, according to department data.

HHS communications director Andrew Nixon said in a statement that the program "gives UACs a choice and allows them to make an informed decision about their future".

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Any payment would be provided after an immigration judge approved the request and the child arrived in their country of origin, Mr Nixon said.

The administration's efforts to swiftly deport unaccompanied children have faced legal challenges.

Last month, a federal judge ordered that the administration refrain from deporting unaccompanied Guatemalan migrant children with active immigration cases while a legal challenge continued.

More than 600,000 migrant children have crossed the US-Mexico border without a parent or legal guardian since 2019, according to government data.