"The reason we're here is because the government of the United States wants you to leave the United States," Judge Ubaid ul-Haq, presiding from a courtroom on Varick Street, told a group of about a dozen children on a recent morning on Webex. "It's my job to figure out if you have to leave," ul-Haq continued. "It's also my job to figure out if you should stay." The parties included a 7-year-old boy, wearing a shirt emblazoned with a pizza cartoon, who spun a toy windmill while the judge spoke. There was an 8-year-old girl and her 4-year-old sister, in a tie-dye shirt, who squeezed a pink plushy toy and stuffed it into her sleeve. None of the children were accompanied by parents or attorneys, only shelter workers who helped them log on to the hearing.