The UK X Factor presenter was in the running for the debut season of the American show but lost out to Steve Jones, who will not be returning for this year's show.
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"I was on the shortlist for it, but I signed for the UK one, and as soon as I did I knew it would probably rule me out, even if I thought I could do both in a sort of Superman, bravado way," O'Leary told ShortList.
"It's a shame. I would have liked to have given it a crack because I think I could have done a good job."
Asked if contestants ever give a fake backstory on The X Factor, he added: "With some people, you just get an inkling, like, 'Really? That can't be right'. But I think they are weeded out before we see them.
"When I meet someone and ask them why they're here, I expect them to say, 'Because I'm a great singer', or, 'Because I've never really sung before and will give it a go'.
"But if someone says, 'I'm doing it for her', and raises up a bemused-looking 2-year-old, I sort of think, 'We're all doing it for her, for our families, aren't we?' Maybe you should just do it because you can sing."








