Illinois ? U.S. Sen. Roland Burris now acknowledges attempting to raise money for ousted Gov. Rod Blagojevich — an explosive twist in his evolving story on how he landed a coveted Senate appointment from the man accused of trying to sell the seat.

Burris made the admission to reporters late Monday, after releasing an affidavit over the weekend saying he had more contact with Blagojevich advisers about the Senate seat than he had described under oath to the state House panel that recommended Blagojevich’s impeachment. The Democrat also said in the affidavit, but not before the panel, that the governor’s brother asked him for fundraising help.

Though Burris insists he never raised money for Blagojevich while the governor was considering whom to appoint to the seat President Barack Obama vacated, the revelation that he had attempted to do so is likely to increase calls for Burris’ resignation.