A federal judge on Friday paused the Trump administration’s efforts to fast-track the deportation of migrants who legally entered the United States through humanitarian parole programs, marking a win for immigrant rights groups who argued the policy was illegal and dangerous.

The ruling blocks a new tactic employed by the Trump administration: detaining immigrants outside court appearances and putting them into a sped-up deportation process known as expedited removal.

A federal judge has agreed to temporarily block the Trump administration’s efforts to expand fast-track deportations of immigrants who legally entered the U.S. under a process known as humanitarian parole.