"Perhaps I can play some other role in the show," he said, calling it "an exciting" concept.
He had hoped to be a contestant but a federal judge in Chicago this week refused to allow him to leave the country to do so.
Blagojevich, who was dressed in a suit and tie despite the outdoor setting, declined to say whether he was being paid for the promotional work. He's set to attend a news conference Friday at which the show's cast will be announced.
He's pleaded not guilty to racketeering, fraud and other charges that allege — among other things — that he schemed to sell President Barack Obama's former U.S. Senate seat.
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