(CNN) A federal judge in California ruled Wednesday that a challenge to the practice of separating parents seeking asylum from children at the border can proceed.

The ACLU brought the case against the Trump administration.

In his opinion, the Judge Dana Sabraw said "at a minimum, the facts alleged are sufficient to show the government conduct at issue 'shocks the conscience' and violates Plaintiffs' constitutional right to family integrity. Accordingly, Defendants' motion to dismiss Plaintiffs' due process claim is denied."

The ruling is a victory for critics of the administration's separation of families — though plenty of hurdles remain before the practice is outlawed.

The ruling does not mean the challenge will ultimately succeed — but it is a substantial step for critics of any separating families who say the practice is abhorrent enough that it should be unconstitutional in any case. The judge's ruling Wednesday keeps that argument alive.

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