Ousted Gov. Rod Blagojevich's longtime top aide won't be pleading guilty to corruption charges just yet.

Alonzo Monk is Blagojevich's former chief of staff, and Monk had been scheduled to change his not guilty plea to guilty on Tuesday.

But on Monday the hearing was postponed until Aug. 27.

Monk is charged with one count of wire fraud for scheming to pressure a racetrack executive for a $100,000 campaign contribution in exchange for the prompt signing by Blagojevich of legislation.

When and if the hearing is held, any written plea agreement between Monk and federal prosecutors could shed important new light on the case.