The person also told The Associated Press on Wednesday that Edwards could strike a plea deal. The person spoke on condition of anonymity because of the case's sensitivity.
The U.S. attorney in Raleigh declined to comment. An Edwards spokeswoman did not immediately return a message seeking comment Wednesday.
Federal investigators have been looking into Edwards' dealings for more than two years. They have focused largely on donations that eventually went to keep mistress Rielle Hunter and an aide in hiding.
Attorneys for Edwards have said they are confident he did not violate campaign finance laws.
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Baker reported from Olympia, Wash.
