The decision by the Atlanta-based U.S. Court of Appeals for the 11th Circuit represented a small victory for the Justice Department, which had sought an expedited appeal, and a blow to Trump, who had tried to slow-walk the litigation.
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Trump is facing a criminal investigation by the Justice Department for retaining government records - some marked as highly classified, including "top secret" - at his Mar-a-Lago estate in Florida after leaving office, and for possible obstruction.
This marks the second time now that the 11th Circuit has ruled favorably for the Justice Department.
Trump on Tuesday asked the Supreme Court in an emergency request to overturn a portion of the 11th Circuit's ruling, saying the 100 records marked as classified should be part of the special master's review.
In the Justice Department's latest and broader appeal over the special master appointment before the 11th Circuit, a different three-judge panel will review the case.
Reporting by Sarah N. Lynch; Additional reporting by Ismail Shakil and Doina Chiacu; Editing by Tim Ahmann and Rosalba O'Brien. »