The hearing is the first about Abrego Garcia's case since El Salvador's president told reporters he is not going to "smuggle a terrorist into the United States."
The memo could result in immigration judges deciding someone is not eligible for asylum without a hearing, and based solely on a lengthy and complex asylum request form.
These judges, and their staff, are caught in the crosshairs of Trump's twin efforts to increase deportations — and reduce the size of the federal government.
Adams was scheduled to go on trial in April until new leadership at the Justice Department under the Trump administration ordered prosecutors in New York in February to drop the case, sparking a public outcry and resignations of prosecutors.
The Justice Department lawyers defending the president's executive orders are struggling to answer questions and correct the record in front of judges.
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 D.C. Circuit Court of Appeals panel denied the Trump administration's push to restart deportations of alleged gang members under a rarely used wartime authority known as the Alien Enemies Act.