NSW Premier Morris Iemma today refused to deny that he knew of three statutory declarations about the Iguanas Waterfront incident, dubbed Iguanagate, that John Della Bosca's office withheld last week.

Mr Iemma's failure today to deny knowledge of the withheld statutory declarations puts him and his office at the heart of the scandal.

The Premier was repeatedly asked this morning at a press conference whether he or his office knew of the statutory declarations written by Federal Labor MP Belinda Neal's staff and supporters to try to back up her version of events.