The leaders of the Congressional Hispanic Caucus (CHC) called Monday for the top federal official in charge of refugee resettlement to explain the administration's policies on detention of immigrant minors.

In a letter to Office of Refugee Resettlement (ORR) Director Scott Lloyd obtained by The Hill, the CHC asked for a meeting with its members “to discuss what ORR is doing to ensure the safety of children in your custody.”

The CHC has met previously to discuss immigration issues with President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's three Homeland Security secretaries, and in September appealed to Health and Human Services Secretary Alex Azar, Lloyd's boss, for information on the housing of undocumented minors.

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In the letter led by CHC Chairwoman Rep. Michelle Lujan Grisham Michelle Lynn Lujan GrishamBiden pick creates furor, underscoring bitterness over Obama immigration policy Buttigieg, former officials added to Biden's transition team No documents? Hoping for legalization? Be wary of Joe Biden MORE (D-N.M.), the Democrats reference Trump's zero-tolerance policy, which led to over 2,500 children being separated from their parents by federal authorities at the border.

“It has been more than three months since a judge ordered the reunification of these children and over 100 children remain separated from their families. We would like to speak to you about the remaining separated children and the administration's timeline in ensuring timely completion of reunification of these families,” reads the letter.

Despite the zero-tolerance policy being rolled back, the number of unaccompanied minors in federal detention has grown to a record 13,300 over the past few months, according to the letter.

That’s due to a number of factors, including a new administration policy to run fingerprint checks on potential foster families, dissuading undocumented immigrants from participating in the foster program.

“This drastic increase is not due to a surge at the border, but rather ORR creating a bottleneck by slowing the release of children to family members and sponsors in the community,” the CHC wrote in its letter to Lloyd.

Lujan Grisham and her co-signers, Reps. Joaquin Castro Joaquin CastroHispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-Texas), Ruben Gallego Ruben GallegoHispanic caucus report takes stock of accomplishments with eye toward 2021 Senators call on Pentagon to reinstate funding for Stars and Stripes newspaper Hispanic Caucus campaign chief to mount leadership bid MORE (D-Ariz.), Pete Aguilar Peter (Pete) Ray AguilarRep. Robin Kelly enters race for Democratic caucus vice chair Pelosi seeks to put pressure on GOP in COVID-19 relief battle Races heat up for House leadership posts MORE (D-Calif.) and Adriano Espaillat Adriano de Jesus Espaillat CabralLawmakers call for small business aid at all levels of government The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy On the Money: Administration to ban TikTok, WeChat | House moves toward bill to avoid government shutdown | Coronavirus relief bills boosted GDP, CBO says MORE (D-N.Y.), also pointed to the cost of housing the undocumented minors, particularly in the Texas facility known as Tornillo.

According to a New York Times report Sunday, hundreds of foreign minors have been transferred to Tornillo, a tent city near El Paso, often with little warning and traveling overnight.

The CHC legislators said the cost of housing a minor at Tornillo can run $750 per day, and the facility is now housing at least 1,600 minors.

That led HHS to reallocate up to $266 million from other programs, including HIV and cancer research, and to allocate $180 million in discretionary funding to house undocumented minors.

“The reallocation of these funds raises many concerns for our members, who are charged with funding critical health and research programs,” reads the letter.