WASHINGTON (AP) — The Trump administration is planning to remove nearly 700 Guatemalan children who had come to the U.S. without their parents, according to a letter sent Friday by Sen. Ron Wyden of Oregon, and the Central American country said it was ready to take them in.

The removals would violate the Office of Refugee Resettlement’s “child welfare mandate and this country’s long-established obligation to these children,” Wyden told Angie Salazar, acting director of the office within the Department of Health and Human Services that is responsible for migrant children who arrive in the U.S. alone.

“This move threatens to separate children from their families, lawyers, and support systems, to thrust them back into the very conditions they are seeking refuge from, and to disappear vulnerable children beyond the reach of American law and oversight,” the Democratic senator wrote, asking for the deportation plans to be terminated.

It is another step in the Trump administration’s sweeping immigration enforcement efforts, which include plans to surge officers to Chicago for an immigration crackdown, ramping up deportations and ending protections for people who have had permission to live and work in the United States.

Guatemala says it’s ready to take in the children

Guatemalan Foreign Affairs Minister Carlos Martínez said Friday that the government has told the U.S. it is willing to receive hundreds of Guatemalan minors who arrived unaccompanied to the United States and are being held in U.S. facilities.

Guatemala is particularly concerned about minors who could age out of the facilities for children and be sent to adult detention centers, he said. The exact number of children to be returned remains in flux, but they are currently discussing a little over 600. He said no date has been set yet for their return.

That would be almost double what Guatemala previously agreed to. The head of the country’s immigration service said last month that the government was looking to repatriate 341 unaccompanied minors who were being held in U.S. facilities.

“The idea is to bring them back before they reach 18 years old so that they are not taken to an adult detention center,” Guatemala Immigration Institute Director Danilo Rivera said at the time. He said it would be done at Guatemala’s expense and would be a form of voluntary return.

The plan was announced by President Bernardo Arévalo, who said then that the government had a moral and legal obligation to advocate for the children. His comments came days after U.S. Homeland Security Secretary Kristi Noem visited Guatemala.

Wyden’s letter says the children ‘will be forcibly removed’

The White House and the Department of Health and Human Services did not immediately respond to requests for comment on the latest move, which was first reported by CNN.

Quoting unidentified whistleblowers, Wyden’s letter said children who do not have a parent or legal guardian as a sponsor or who don’t have an asylum case already underway, “will be forcibly removed from the country.”

“Unaccompanied children are some of the most vulnerable children entrusted to the government’s care,” Wyden wrote. “In many cases, these children and their families have had to make the unthinkable choice to face danger and separation in search of safety.”

The idea of repatriating such a large number of children to their home country also raised concerns with activists who work with children navigating the immigration process.

“We are outraged by the Trump administration’s renewed assault on the rights of immigrant children,” said Lindsay Toczylowski, president and CEO of Immigrant Defenders Law Center. “We are not fooled by their attempt to mask these efforts as mere ‘repatriations.’ This is yet another calculated attempt to sever what little due process remains in the immigration system.”

Due to their age and the trauma unaccompanied immigrant children have often experienced getting to the U.S., their treatment is one of the most sensitive issues in immigration. Advocacy groups already have sued to ask courts to halt new Trump administration vetting procedures for unaccompanied children, saying the changes are keeping families separated longer and are inhumane.

Migrant children traveling without their parents or guardians are handed over to the Office of Refugee Resettlement when they are encountered by officials along the U.S.-Mexico border. Once in the U.S., they often live in government-supervised shelters or with foster care families until they can be released to a sponsor — usually a family member — living in the country.

They can request asylum, juvenile immigration status or visas for victims of sexual exploitation.

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Gonzalez reported from McAllen, Texas. AP writers Sonia Pérez D. in Guatemala City and Tim Sullivan in Minneapolis contributed to this report.