Simon Cowell on Howard Stern, 'America's Got Talent', and Piers Morgan

"Extra" caught up with Simon Cowell backstage after "The X Factor" elimination show to talk about Piers Morgan leaving "America's Got Talent" (which Cowell also produces) -- and about the buzz that "AGT" is in talks with Howard Stern to replace Morgan.

Cowell said he loves Stern, but admitted, "That would be a difficult guy to produce."

The "X Factor" judge wished his friend Morgan success in his decision to concentrate on his CNN show, "Piers Morgan Tonight."

Cowell said, "He's got a big year coming up next year with the elections, and he's made a name for himself now. He's a grown-up. But we'll be working together again."

Meanwhile, judge Paula Abdul told "Extra" the elimination show Thursday was an emotional one, as she had a hard time selecting who had to go. "There's nothing any of my groups could have done to be any better, brighter, bigger. They worked hard and they were fantastic."

Tune in next week for more "The X Factor" on FOX!