Prosecutors in the case of Rod Blagojevich say they have new material in the case against the former governor they don't want to disclose just yet.
They are asking to file under seal something called a Santiago Proffer, which is often seen as a road map to the government's case at trial.
In a written petition in federal court, prosecutors ask "in an abundance of caution," to file the document under seal to give the judge and the defense a first look before it hits the news.
Today's request by prosecutors says that the process of qualifying jurors had begun and the government didn't want to taint a potential pool by making the document public.
The proffer is usually rich in detail and forecasts expected testimony by key witnesses at trial.
"There is evidence described in the government's proffer that has not previously been disclosed," prosecutors indicated in today's filing.
The proffer is usually filed close to trial. Blagojevich, who was fired from Donald Trump's "Celebrity Apprentice" just last night, is scheduled to go to trial June 3.