A lewd note allegedly from Donald Trump wishing late sex offender Jeffrey Epstein happy birthday in 2003 — and alluding to their unnamed "wonderful secret" — has been released by Democrats, after the US president denied it existed.

Democrats on the US House Oversight Committee, which is probing the handling of criminal investigations into the financier, published the letter on social media after it was delivered by Epstein's estate.

The note is inserted into the sketched outline of a nude woman, and was allegedly part of a book of letters from Epstein's friends, compiled by his now-imprisoned associate Ghislaine Maxwell for the financier's 50th birthday.

The White House reiterated its denial of the authenticity of the letter on Monday, with Press Secretary Karoline Leavitt saying: "It's

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