The Court of Appeal has heard that letter, sent to the Director of Public Prosecutions on behalf of struck-off solicitor Michael Lynn, claimed the State was trying to "nail" an "innocent man" .
50-year old Michael Lynn, a Mayo native with an address at Carlton Square, Maynooth, Co Kildare, is due to stand trial at Dublin Circuit Criminal Court next year on 21 counts of stealing almost €30m from seven financial institutions.
In two of the sample charges, Mr Lynn is accused of stealing €4.1m from Irish Nationwide on April 4, 2007 and €3.6m from Ulster Bank on October 20, 2006.
He left Ireland in 2007 but was extradited last year from Brazil where he had spent four-and-a-half years in jail on remand.
Brazilian authorities sought assurances that any time Mr Lynn spent in prison awaiting extradition would be deducted from any potential prison sentence here, and he would not serve more than 30 years in prison here if found guilty.
The Irish Independent reports that his lawyers challenged those assurances in the Irish High Court, arguing they could not have been given.
But their arguments were rejected, and the case came before the Court of Appeal yesterday where judgment was reserved.