LOS ANGELES (AP) — Attorneys for CBS claim the producer of an upcoming ABC reality series copied materials from his time on “Big Brother” and deleted emails that could have proved important in a case over whether the new show should be allowed to air.

The allegations were included in a filing Thursday that asked a federal judge to block the June 18 premiere of ABC’s “The Glass House.” CBS claims the series copies heavily from its hit show “Big Brother” and relies on experience and techniques used on that long-running series.