The leak involved an internal 2009 email, released as part of the Epstein files, detailing government tax plans and asset sales to then-Prime Minister Gordon Brown.
Lord Mandelson forwarded this email to Epstein, describing it as an "Interesting note that’s gone to the PM."
Gordon Brown has demanded an investigation into the "wholly unacceptable disclosure," while the memo's author called it a "disgusting breach of trust."
Lord Mandelson resigned his Labour membership on Sunday night and was facing disciplinary action from the party.
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