A judge has ordered the Justice Department to make public a redacted version of the affidavit it relied on when federal agents searched the Florida estate of former President Donald Trump to look for classified documents.

The directive from US Magistrate Judge Bruce Reinhart came hours after federal law enforcement officials submitted under seal the portions of the affidavit that they want to keep secret as their investigation moves forward.

The redaction order means the public could soon get at least some additional details about what led FBI officials to search Mar-a-Lago on August 8 as part of an investigation into classified documents being retained at the Palm Beach property. Documents already made public as part of the investigation show that the FBI retrieved from the property 11 sets of classified documents, including information marked at the top secret level.

Still, the redactions proposed by the Justice Department are likely to be extensive given the sensitivity of the investigation and unprecedented nature of the search, so it's unlikely that the public will receive a detailed glimpse of the basis for the search or the direction of the probe.

The department had contested arguments by media organisations to make any portion of the affidavit public, but a judge last week said he was disinclined to keep the entire document sealed and told federal officials to submit to him in private the redactions it wanted to make. Even so, he acknowledged that the blacked-out portions might be so extensive as to leave the public version of the document without any meaningful information.

This is an aerial view of Donald Trump's Mar-a-Lago estate, in Palm Beach, Florida. Photo / AP

Multiple news media organisations argued in court last week for the disclosure of the affidavit, citing the extraordinary public interest in the federal search of a former president's home. Trump and some of his supporters have also encouraged the document's release.

After the Justice Department submitted its filing under seal, the media coalition responded by asking the judge to unseal portions of the department's brief and to direct the government, "going forward", to file publicly a redacted version of any sealed document it submits. The groups noted that significant information about the investigation is already public.

"At a minimum, any portions of the Brief that recite those facts about the investigation, without revealing additional ones not yet publicly available - in addition to any other portions that pose no threat to the investigation - should be unsealed," the news organisations wrote.

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They added: "If and when additional facts come to light and are confirmed to be accurate, or certain facts no longer pose a threat to the investigation for any other reason, there is no justification for maintaining them under seal either."