The former CBS Radio employee now employed by Sirius Satellite Radio, Stern used CBS airwaves Monday night to label CBS Chairman Les Moonves a bully for the lawsuit the network filed against Stern, alleging multiple breaches of his contract, the New York Daily News reported Tuesday.
The suit claims Stern cut a secret deal to lure listeners to Sirius while he was still a CBS employee.
Wearing a T-shirt with a picture of Moonves and his wife, CBS "Early Show" anchor Julie Chen, Stern told Letterman: "I believe you are working for one of the biggest jerks on the planet."
A CBS spokesman told the Daily News no effort was made to keep Stern off Letterman and called his appearance a "desperate attempt to distract attention from the facts of the case."
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