The order marks a win for the Trump administration, even if temporary, and it could well be a harbinger of things to come as the administration continues to clash with federal courts.
This latest case, in which lawyers argue their client had no proven links to MS-13, adds to the growing judicial and public scrutiny about the deportations to El Salvador's notorious mega-prison.
The American Civil Liberties Union and Democracy Forward sued the Trump administration over its use of the wartime law to quickly deport people, which they say violates due process.
Judge James Boasberg had earlier asked the Trump administration to provide more details about weekend flights that deported hundreds of alleged Venezuelan gang members to El Salvador — despite his order to turn the planes around.
Judge Boasberg's role overseeing a new case that challenges the deportation of alleged Venezuelan gang members to El Salvadorhas cast an even brighter light on the longtime judge.
President Trump justified his use of a wartime law to deport people. The CEO of Democracy Forward argues that the president is using it to claim powers not granted to him under the Constitution.
It was not clear if the deportations happened before a D.C. federal judge ordered the administration to stop using wartime powers to deport anyone immediately, and turn around any planes in the air.
President Trump says he would deport American criminals to El Salvador "in a heartbeat" if it were legal. An ACLU attorney tells NPR that such an idea "would be blatantly unconstitutional."
A U.S. official said the Trump administration had no plans to try to deport American citizens. The U.S. government cannot deport American citizens and such a move would be met with legal challenges.
In Legacy of Lies, El Salvador 1981-1984, photojournalist Robert Nickelsberg documents how U.S. foreign policy fueled a violent 13-year civil war in El Salvador.
Salvadoran photographer Carlos Barrera takes a look at the nearly two years of human rights violations allegedly committed by the government of El Salvador during the country's state of emergency.