In a filing Friday, prosecutors say Sam Adam, Jr. and Sam Adam, Sr. lied by telling the media that a retrial would cost up to $30 million.
They also said that overwhelming evidence led to Blagojevich's conviction and called any claims of prosecutorial misconduct baseless.
Blagojevich was convicted on just one count of lying to the FBI.
He faces a retrial on the 23 remaining counts next year.