U.S. District Judge Dana Sabraw appeared conflicted in early May on whether to stop families from being separated at the border. He challenged the Trump administration to explain how families were getting a fair hearing guaranteed by the Constitution, but also expressed reluctance to get too deeply involved with immigration enforcement.

"There are so many (enforcement) decisions that have to be made, and each one is individual," he said in his calm, almost monotone voice. "How can the court issue such a blanket, overarching order telling the attorney general, either release or detain (families) together?"

Sabraw showed how more than seven weeks later in a blistering opinion faulting the administration and its "zero tolerance" policy for a "crisis" of its own making. He went well beyond the American Civil Liberties Union's initial request to halt family separation — which President Donald Trump effectively did on his own amid a backlash — by imposing a deadline of this Thursday to reunify more than 2,500 children with their families.

Unyielding insistence on meeting his deadline, displayed in a string of hearings he ordered for updates, has made the San Diego jurist a central figure in a drama that has captivated international audiences with emotional accounts of toddlers and teens being torn from their parents.

Circumstances changed dramatically after the ACLU sued the government in March on behalf of a Congolese woman and a Brazilian woman who were split from their children. Three days after the May hearing, U.S. Attorney General Jeff Sessions announced the zero tolerance policy on illegal entry was in full effect, leading to the separation of more than 2,300 children in five weeks.