The judge overseeing the court-ordered reunification of the 2,551 migrant children separated from their parents at the border blasted the Trump administration Friday for its lack of a plan to reunify the remaining 572 children in its custody with their parents and the slow pace of progress.

In a Thursday night status report filing, the Trump administration said only 13 of the parents had been located by the ACLU, which Judge Dana Sabraw of the Southern District of California called “unacceptable at this point.”

The parents of 410 children are currently outside of the United States, likely having been deported before reunification, according to the court filing.

The Trump administration had proposed the ACLU take the lead in locating and identifying what the judge had called “missing parents” of children still in government custody. Sabraw said that plan was not acceptable and placed that responsibility squarely on the government.