(NewsNation) — Detention centers across the United States that are housing immigrants who entered the country illegally are beginning to fill up despite the Department of Homeland Security recently adding four new facilities that will hold those in federal custody facing deportation.

About 1,000 of the 5,000 detention beds at Fort Bliss in El Paso, Texas — nicknamed “The Lonestar Lockup” — are expected to be filled by the end of this week. The facility is considered the nation’s largest immigrant detention center and began adding detainees earlier this week, when 100 immigrants were moved into the center.

Texas Republican lawmakers, including U.S. Rep. Tony Gonzales and U.S. Sen. John Cornyn, have toured the Fort Bliss detention center, which other local officials have characterized as a

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