While the ruling does not order Khalil’s immediate release, it does undermine the US government’s case against Khalil.

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A federal judge in New Jersey has ruled the administration of United States President Donald Trump cannot use an obscure law to detain Columbia University student Mahmoud Khalil for his pro-Palestine advocacy.

The ruling from US District Judge Michael Farbiarz on Wednesday cut to the core of the Trump administration’s justification for deporting Khalil, a permanent US resident. But it came short of ordering Khalil’s immediate release from detention.

Instead, Judge Farbiarz gave the administration until 9:30am local (13:30 GMT) on Friday to appeal. After that point, Khalil would be eligible for release on a $1 bail.