Developer Donald Trump isn't waiting for the publication of a book exposing the underbelly of his casino empire to try to squash the story, the author says.

The book, "Trumped: The Decline and Fall of Donald Trump" was written by former Trump Plaza Hotel and Casino President Jack O'Donnell. It is due to be published May 1.O'Donnell, the chief operating officer at rival Merv Griffin's Resorts Casino Hotel, said Trump attorneys barged into his office unannounced on Wednesday and tried to intimidate him. Trump on Thursday denied the charge.

"Jack O'Donnell is a man who is a disgruntled former employee," Trump said in a telephone interview from New York City. "He went to work for Merv Griffin. I'm surprised Merv Griffin would allow him to write such a book. But life is full of surprises."