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, leader of the House Oversight Committee, represents an expansion of the committee's investigation into Epstein, the disgraced late financier.

Last month, the Wall Street Journal reported that the birthday book created in 2003 by Epstein’s associate, Ghislaine Maxwell, contained messages from various acquaintances, including a note allegedly signed by Donald Trump, who was a friend of Epstein at the time.

Trump has denied writing such a note.

Comer's subpoena asks the executors of Epstein's estate to provide all entries from the reported leather-bound book compiled by Maxwell, with a deadline of September 8 for submission.

A lawyer for the Epstein estate confirmed receipt of the request, stating that they would comply with all lawful processes, including this subpoena.

Other requested documents include any non-disclosure agreements executed by Epstein over a three-decade period and his will prior to his death in jail in 2019.

Additionally, the subpoena demands any document that could be construed as a potential list of clients involved in sex acts, sex trafficking, or other illicit activities connected to Epstein.

Despite past assertions about the existence of a client list, both the US Department of Justice and the FBI have stated that no such list exists, a claim denied by Maxwell during a recent inquiry.

Speculation continues about the involvement of high-profile individuals in Epstein's alleged crimes, as Trump faces increasing pressure for transparency regarding documents related to the investigation.

Comer has previously issued subpoenas to significant figures, including former President Bill Clinton and Secretary of State Hillary Clinton, as part of this inquiry.

In May, Trump was informed by Attorney General Pam Bondi that his name appeared in files pertaining to the investigations, although being named does not imply any wrongdoing.

Trump's relationship with Epstein reportedly soured around 2004. In past campaign remarks, Trump indicated a willingness to disclose more information regarding this issue, but has recently reversed his stance, deeming the matter 'closed' and criticizing supporters who seek further detail.