More than 50 Venezuelans were believed to be scheduled to be flown out of the country, presumably to El Salvador, from an immigration detention center in Anson, Texas.

“The Government is directed not to remove any member of the putative class of detainees from the United States until further order of this Court,” the order said, noting that Justices Samuel Alito and Clarence Thomas had dissented, and that Alito was planning to write a response.

President Donald Trump’s administration asked the Supreme Court to roll back its decision to block the deportation of Venezuelans to a notorious prison in El Salvador, arguing that the early-morning order was overbroad and premature.