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PITTSBURGH-- Duquesne University says TV personality Geraldo Rivera isn't welcome to appear on a panel at the Pittsburgh school because of a half-naked self-portrait he posted this summer.

Duquesne says the cellphone picture Rivera posted on Twitter in July was inappropriate and not in line with the school's values as a Catholic university.

Rivera had been scheduled to moderate a panel to mark the 50th anniversary of President John F. Kennedy's assassination. Rivera says he learned of the cancellation last week.

He couldn't immediately be reached for comment. Duquesne spokeswoman Bridget Fare didn't immediately respond to a question about whether Rivera will be welcome at future events.