she didn't hold back on her critics. mary bruce is tracking it all from washington. good morning. >> reporter: good morning, george. well, the explosive charges in this new book are rocking the democratic party and re-opening old wounds from that bitter democratic primary and now the book's author, donna brazile, the former head of the dnc is coming out swinging against her critics. >> for those telling me to shut up they told hillary that a couple of months ago. you know what i tell them, go to hell. >> reporter: in an exclusive interview with george, donna brazile, the former head of the dnc, tells her side of the story. the latest stunning revelation, she considered replacing hillary clinton. >> i was under tremendous pressure after secretary clinton fainted to have a, quote/unquote plan b. >> reporter: after this moment just two months before election day, brazile considered putting joe biden at the top of the ticket. again and again i thought about joe biden she writes but adds...