The journalist has written The Intimate Life Of Simon Cowell, which is being serialised by The Sun. In the book, details of Cowell's previously-unknown relationship with Dannii Minogue are revealed, as well as information regarding his other past girlfriends.
Speaking on ITV's This Morning, the music mogul's long-term publicist said that Bernie Ecclestone had advised Cowell to "talk to [Bower], co-operate with him, because it will be better for you if you do. My attitude was the opposite... Tom only does what he wants to do and the more controversial and sensational the more it's going to sell."
Yesterday, Clifford confirmed Cowell's relationship with Minogue, something he explained that he had worked to "keep out of the press myself for a long time - along with other stories".
He said: "I did it because I thought it was in his best interest. I've been involved with Simon for ten years and obviously you make your own decisions on these things, but I think that both of them didn't want it to come out so I was happy to do my best to make sure it didn't happen. And up until the book it didn't happen."
> Simon Cowell 'didn't want Dannii Minogue relationship to come out'
> Daily Mail 'arrogance' lost it Simon Cowell biography syndication
When asked by presenter Phillip Schofield if the book "undermined" Clifford's previous work, he said: "You've got one or two stories - there's a hundred you haven't got and hopefully you won't have... but the fact of the matter is, my advice was, 'Don't talk to Tom', because if you do people will think that you've worked with him on the book as opposed to him coming out with a book and you saying, 'Well that's Tom's view of everything, but I've never spoken to him'.
"In my view, Simon should have been in a position to say, 'Look, this is nothing to do with me, I've never met the man, I've never spoken to the man', and as I say, when you're working with someone like Tom Bower, you know what he is out to do - you've only got to look at the books he's written very successfully over the years."
He continued: "The big problem I've had with this is because a lot of it is from Simon's own words, and this is a man who for ten years I protected and always was desperately, desperately keen to have a private life and keep his private life very private."
When Schofield noted that Clifford sounded "disappointed", he responded: "Of course I'm disappointed. We've had a close relationship for many, many years, I think the world of the guy, I think what Tom Bower says in the book speaks very highly of him as a person - someone who had a lot of failure and turned it into huge success... but I just think, we as a team, have scored a massive own goal by talking to the man."
He went on to confirm that yesterday he had "six different girls" contact his firm claiming to have had relationships with the Britain's Got Talent judge.
"I'm sure that loads of girls will be contacting newspapers - many of whom have probably never even met him or have just had a picture taken with him," he said. "But that's inevitable and that would happen because of the Tom Bower book.
"So the difference is, he shouldn't have spoken to him in my opinion because that's given it, if you like, credibility from his own mouth - and that will upset Dannii and everybody else."
> Sinitta agreed not to contribute to Simon Cowell book: I kept my word
> Simon Cowell dated three girls at once, says Sharon Osbourne
Photo gallery - Simon's exes: