to back up kasran's testimony.he fec eventually dropped the investigation into buchanan. but fined kasran $5,000. why? because he admitted reimbursing employees for campaign contributions. while the congressman has said that proves he's innocent, the findings at the fec were more convoluted. that it is more likely than not that buchanan violated the law. and that's where this gets much more serious for the congressman. during the fec probe, congressman buchanan pushed to settle a lawsuit kasran had brought against him. and at the last minute, with a $2.9 million settlement offer from buchanan dangling in front of him, kasran said he was given this. >> they wanted me to sign this affidavit. >> reporter: according to kasran, the congressman and his attorneys were asking him to sign a statement that was a lie. that buchanan knew nothing about the campaign cash swap. and the affidavit said? >> in short, it was "this thing did happen but mr. buchanan had nothing to do with this." >> reporter: kasran refused to sign and