“I think it was just racism, pure and simple,” he writes in his book, The New York Times reported.
The book is called “A Mayor’s Life: Governing New York’s Gorgeous Mosaic,” and is scheduled for release in September.
In it, he calls Mr. Giuliani a “cold, unkind person” who “apparently has some difficulty apologizing for anything,” The New York Times reported. He also accused Mr. Giuliani of spying on his campaign and said the ex-mayor ran a campaign with this racist message: “The city is in terrible financial straits. Do you really want a black man presiding over it in this time of trouble?”