Sharon Osbourne in reality show battle with NBC

LOS ANGELES (AP) NBC is defending itself against Sharon Osbourne's claim the network discriminated against her afflicted son in casting a new reality show.

The "America's Got Talent" judge told The New York Post that she's quitting the show because NBC fired Jack Osbourne by email two days before he was to co-star on the reality show "Stars Earn Stripes."

Sharon Osbourne told the Post that her 26-year-old son, recently diagnosed with multiple sclerosis, is a victim of discrimination.

In a statement Monday, NBC Entertainment Chairman Bob Greenblatt said the network "does not discriminate on any basis."

Greenblatt said all potential contestants had to undergo medical vetting, but cited medical privacy laws in declining to comment about Jack Osbourne specifically. Jack Osbourne was offered two alternative roles on the show that he declined, Greenblatt said.