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.
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 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.
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.
However, the US Department of Justice and FBI have stated that no such list existed.
Maxwell - who is serving time in jail for her involvement in Epstein's offences - also denied that there was a list, when recently questioned by a US Department of Justice (DoJ) official.
Conspiracy theories related to the Epstein case persist, as Trump faces increasing pressure from his supporters and figures within the GOP for more clarity on his connections to Epstein. The committee has also issued subpoenas to high-profile individuals including former President Bill Clinton.