Blagojevich was arrested in December of 2008, and earlier this year was convicted on a single count of lying to the FBI.
Rezko had previously written a letter to his own trial judge, Amy St. Eve, accusing the government of pressuring him to lie about Blagojevich and others. But in Thursday's filing, prosecutors state that Rezko had in fact recanted that letter, "and admitted it was false when written in an attempt to secure bond during his trial."
The motion filed by prosecutors goes on to say that Rezko offered damning evidence against his longtime friend. Prosecutor Reid Schar declared that "on the very first day Rezko began being interviewed by the government, Rezko incriminated the defendant and himself in far reaching corruption schemes."
Rezko was never called as a witness during the first Blagojevich trial. His attorney, Joe Duffy, said he is still willing to testify and would be a valuable witness for the government.