Senators will consider charges that the Democratic governor tried to sell a Senate seat, used his authority to pressure campaign contributors and defied legislative decisions.
Blagojevich is refusing to take part in the trial. He says its rules are so biased that he can't present a defense. The judge ordered the trial to proceed as if Blagojevich had entered a plea of not guilty.
Blagojevich spent Monday in New York, where he made several TV appearances to proclaim his innocence.
It would take a two-thirds vote in the Senate to convict Blagojevich and remove him from office. Senators also could vote to bar him from ever holding office again.
Slideshow archive | ABC13 wireless | Help solve crimes