Several Big Law firms, including Kirkland & Ellis, Covington & Burling and Quinn Emanuel Urquhart & Sullivan, have teamed up to reunite immigrant and asylum-seeking families who’ve been separated under the Trump administration’s zero tolerance policy.

Over 2,300 children have been separated from their parents since the administration policy was announced in April, which led to a dramatic ramp-up in criminal prosecutions of immigrants who illegally crossed the United States’ southwestern border.