U.S. District Judge Aileen Cannon made the ruling Tuesday, the morning after an emergency request by defense lawyers to stop the Justice Department from making the report public — a step that Smith had said could come as early as Friday.
The matter is being considered by the Atlanta-based 11th U.S. Circuit Court of Appeals.
The report is expected to describe charging decisions made in separate investigations by Smith into presidential documents at Trump's Mar-a-Lago estate.
Trump was charged alongside two codefendants in the classified documents case, which was dismissed in July by a Trump-appointed judge who concluded that Smith's appointment was illegal. Trump was also charged in an alleged election interference case that was significantly narrowed by a Supreme Court ruling on presidential immunity.
Smith's team abandoned both cases in November after Trump's presidential victory, citing Justice Department policy that prohibits the federal prosecutions of sitting presidents.