The parents of 61 migrant children who have been separated from their households on the U.S.-Mexico border by the Trump administration have been positioned since February, however attorneys still can not discover the parents of 445 children, in line with a court filing on Wednesday.

In the filing, the Justice Department and the American Civil Liberties Union indicated gradual progress in the continuing effort to reunite households that have been affected by a coverage to prosecute all undocumented immigrants in the United States, even when it meant separating children from their parents.

The replace in the reunification efforts comes because the Biden administration struggles to deal with a rising number of migrants looking for entry into the United States on the border with Mexico, together with many children being held in jail-like facilities for longer than the legislation permits due to overcrowding.

Of the 445 remaining children, a majority are believed to have parents who have been deported, whereas greater than 100 children are believed to have parents presently in the United States, in line with the court filing. The authorities has but to offer contact data that might assist find the households of greater than a dozen children.

Though the court filing says that U.S. businesses and the A.C.L.U. proceed to work collectively to reunite the households, the trouble has proved to be more difficult as time passes. The preliminary searches started years in the past, under the Trump administration, after the coverage of household separation was rescinded in the summer time of 2018.

Only a fraction of the roughly 2,700 children who have been initially separated under the coverage still stay, and President Biden has indicated that reuniting these remaining children with their households is a precedence. During his first week in workplace, Mr. Biden signed an government order making a job drive led by Alejandro N. Mayorkas, the homeland safety secretary, to give attention to reuniting households.

Advocates for households separated on the border in the course of the Trump administration proceed to stress the president to maneuver sooner to reunite them. Lee Gelernt, an A.C.L.U. lawyer who has waged a prolonged authorized battle in opposition to Mr. Trump’s separation coverage, stated some progress had been made however rather more wanted to be completed.

“We and the Biden administration have enormous work yet to do if we are going to fix the terrible abuses of the Trump administration’s family separation practice,” he stated.