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 bawdy note allegedly bearing the name of Donald Trump, who was then his friend. Trump has denied writing any such letter.

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 8 September 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, and that includes the Committee's subpoena. This investigation extends to other documents, including non-disclosure agreements executed by Epstein and his will preceding his death in jail in 2019.

The subpoena further demands any documents that could indicate a potential list of clients involved in sex, sex acts, or sex trafficking by Epstein. Reports suggest that unreleased Epstein files could implicate high-profile associates beyond Maxwell in his criminal operation; however, the US Department of Justice and FBI have stated that no such list existed.

Maxwell, who is serving time in jail, has also denied the existence of a client list. As pressure mounts from Trump supporters for increased transparency regarding the Epstein investigations, including subpoenas issued to notable figures such as Bill and Hillary Clinton, the case continues to develop amidst significant public interest.