The attorneys want to move the trial from June to September to give them time to review a ruling expected in Spring from the U.S. Supreme Court.
The ruling, on the "honest services" provision of the federal mail fraud statute, criminalizes conduct in which public officials breach the "honest services" they owe the public.
Blago's lawyers argue that the Supreme Court's ruling could challenge the "foundational underpinnings for the majority of Rod's charges."
The Supreme Court will hear arguments on three cases in December, and Blago's lawyers say the high court's rulings could come by Spring.
Blago's case receives a status hearing on Monday. U.S. District Judge James Zagel has said at prior hearings that he leans against moving the trial date.