The federal agency responsible for caring for unaccompanied alien children is pushing back against accusations that it has lost nearly 1,500 of them, knocking critics that “confuse and spread misinformation” about the issue.

Most of the children were not lost, but were temporarily unaccounted for because their sponsors did not respond to inquiries from government officials, Department of Health and Human Services (HHS) Deputy Secretary Eric Hargan said in a statement released Monday,

“These children are not “lost”; their sponsors — who are usually parents or family members and in all cases have been vetted for criminality and ability to provide for them — simply did not respond or could not be reached when this voluntary call was made,” Hargan said. “While there are many possible reasons for this, in many cases sponsors cannot be reached because they themselves are illegal aliens and do not want to be reached by federal authorities.”

Hargan was responding to a recent spate of reports that the Office of Refugee Resettlement (ORR) — the HHS sub-agency that places unaccompanied alien children (UAC) with relatives or other sponsors in the U.S. — lost track of 1,475 migrant children during a three-month period in 2017. In recent weeks, coverage of the unaccompanied minor problem has intensified in light of the Trump administration’s policy of separating some illegal immigrant families at the southwest border, though they are two distinct issues.

The most recent round of media attention homed in on a bit of testimony that Steven Wagner, the acting head of HHS’s Administration for Children and Families, gave to Congress in April. Wagner told lawmakers that ORR had contacted 7,635 unaccompanied alien children and their sponsors between October and December 2017, but was unable to “determine with certainty” the whereabouts of 1,475 of them. (RELATED: Feds Struggle To Cope With Growing Wave Of Unaccompanied Child Migrants)

Wagner’s testimony also included data about steadily rising levels of illegal immigration by unaccompanied minors and people traveling in family units. Immigration authorities referred 40,810 children to ORR in all of fiscal year 2017, but in the first six months of fiscal 2018, HHS has had 21,574 referrals, putting it on pace for a six percent increase.

After slowing to a trickle in the early months of the Trump administration, monthly UAC referrals are approaching levels last seen during the Central American migrant crisis of the Obama administration’s last three years. HHS received 755 UAC referrals in March 2017, compared to 4,205 in March of this year — a 450 percent year-over-year increase.

Wagner hit back at critics on Monday, saying that ORR was not designed to be a long-term guardian for illegal immigrant children.

“It was never intended to be a foster care system with more than 10,000 children in custody at an immediate cost to the federal taxpayer of over one billion dollars per year,” he said, according to CNN.

Hargan made a similar argument, saying that a focus on “lost” migrant children ignored the bigger issue: immigration laws that “aggravate the problem and put children in dangerous situations.”

“The tracking of UAC after release is just one of the recent headlines that focus on the symptoms of our broken immigration system while ignoring its fundamental flaws,” he said. “President Trump’s administration has been calling on Congress to put an end to dangerous loopholes in US immigration laws like the practice of ‘catch and release,’ in which federal authorities release illegal immigrants to await hearings for which few show up.”

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