(CNN) — The Trump administration conceded in a court filing Monday that it mistakenly deported a Maryland father to El Salvador “because of an administrative error” and argued it could not return him because he’s now in Salvadoran custody.

The filing stems from a lawsuit over the removal of Kilmar Armando Abrego Garcia, a Salvadoran national who in 2019 was granted protected status by an immigration judge, prohibiting the federal government from sending him to El Salvador.

The filing, first reported by The Atlantic, appears to mark the first time the administration has admitted an error related to its recent deportation flights to El Salvador, which are now at the center of a fraught legal battle.

“On March 15, although ICE was aware of his protection from removal to El Salvador, Abrego Garcia was removed to El Salvador because of an administrative error,” the Trump administration filing states.

Abrego Garcia, who attorneys say fled gang violence in El Salvador more than a decade ago, had been identified by his wife in a photo of detainees entering intake at El Salvador’s notorious mega-prison CECOT.

Prior to his removal, he had been arrested by Immigration and Customs Enforcement in mid-March “due to his prominent role in MS-13,” according to a court declaration from a senior ICE official. His attorneys say he’s not a member of nor has any ties to the MS-13 gang.

“Abrego-Garcia was not on the initial manifest of the Title 8 flight to be removed to El Salvador,” Robert Cerna, an acting ICE field office director, said in his declaration, referring to federal immigration law. “Rather, he was an alternate. As others were removed from the flight for various reasons, he moved up the list and was assigned to the flight. The manifest did not indicate that Abrego-Garcia should not be removed.”

“Through administrative error, Abrego-Garcia was removed from the United States to El Salvador. This was an oversight, and the removal was carried out in good faith based on the existence of a final order of removal and Abrego-Garcia’s purported membership in MS-13,” the declaration reads.

The administration argued that it cannot bring back Abrego Garcia because he’s in Salvadoran custody and knocked down concerns that he’s likely to be tortured or killed in CECOT.

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