A US panel investigating the crimes of Jeffrey Epstein has requested that the executors of his estate produce a number of documents, including a book said to have contained personal messages for his 50th birthday.

The subpoena from James Comer, the leader of the House Oversight Committee, represents an expansion of his investigation into Epstein, the disgraced late paedophile financier.

Last month, the Wall Street Journal reported that the birthday book his associate Ghislaine Maxwell created in 2003 contained submissions from various Epstein acquaintances, including a note allegedly bearing the name of Donald Trump, who was then his friend.

Trump has denied writing any such letter.

The president said the alleged note was “fake” and began defamation proceedings against the Journal's parent company and its owner, Rupert Murdoch. The company, Dow Jones, stood by its reporting and vowed to fight the legal case.

Comer's subpoena asks that the executors of Epstein's estate provide “all entries contained within the reported leather-bound book compiled by Ms. Ghislaine Maxwell”. It gives a deadline of September 8 for the item to be turned over.

A lawyer for the Epstein estate confirmed receipt of the request, and said the executors would “comply with all lawful process in this matter, including the Committee's subpoena”.

Among other papers, it also requests any non-disclosure agreements executed by Epstein over a three-decade period, and his will preceding his death in jail in 2019.

It further demands “any document or record that could be reasonably construed to be a potential list of clients involved in sex, sex acts, or sex trafficking” by Epstein.

Conspiracy theories persist around unreleased Epstein files, which some suggest could contain a client list implicating high-profile figures beyond Maxwell.

However, the US Department of Justice and the FBI have claimed that no such list exists. Maxwell also denied the existence of a list when questioned by a Department of Justice official.

Trump has been pressured by supporters for greater transparency regarding Epstein files, as the investigation continues to unfold.