Peter Mandelson has been accused of giving paedophile financier Jeffrey Epstein advanced notice of a €500bn EU bank bailout in 2010.
The latest claim comes from documents released by the US Department of Justice as part of millions of files relating to Epstein.
According to the documents, Lord Mandelson, then the UK's business secretary, was emailed by Epstein, who wrote: "Sources tell me 500 b euro bailout , almost compelte (sic)."
Lord Mandelson then appears to email: "Sd (sic) be announced tonight".
Epstein then asks if he is home, to which Mandleson replies: "Just leaving No10... will call".
The €500bn deal was approved the next day by European governments as they tried to pull the currency through the 2010 "Eurozone" crisis - where countries such as Greece, Portugal, Ireland, and Cyprus were unable to repay or refinance their government debt.
The UK did not contribute to the bailout.
However, the then-chancellor Alistair Darling was present in Brussels for the negotiations.
Paste BN has approached representatives for Lord Mandelson for comment on these claims.
In a statement about previous allegations, he said: "I was wrong to believe Epstein following his conviction and to continue my association with him afterwards. I apologise unequivocally for doing so to the women and girls who suffered."
Responding to claims that Lord Mandelson leaked confidential and privileged information while he served as business secretary during Gordon Brown’s premiership, Mr Brown said: "I have today asked the Cabinet Secretary to investigate the disclosure of confidential and market sensitive information from the then Business Department during the global financial crisis."