The US Department of Justice (DOJ) has said it has released all of the files required by the Epstein Files Transparency Act, but lawmakers have argued the release is insufficient.

The letter sent to Congress members on Saturday from Pam Bondi and Todd Blanche said all documents in the possession of the DOJ had been released and provided a list of names contained in the files.

Kentucky Republican Rep Thomas Massie, who co-wrote the law, called for the DOJ to also release internal memos outlining past decisions on whether to charge Epstein and his associates.

Millions of new files relating to the late sex offender Jeffrey Epstein were released by the DOJ earlier this month.

In the letter, Attorney General Bondi and Deputy Attorney General Blanche wrote: "In accordance with the requirements of the Act, and as described in various Department submissions to the courts of the Southern District of New York assigned to the Epstein and Maxwell prosecutions and related orders, the Department released all 'records, documents, communications and investigative materials in the possession of the Department' that 'relate to' any of nine different categories."