(POLITICO) — The Rush Limbaugh Program is considering ending its affiliation agreement with Cumulus Media at the end of this year, a move that would bring about one of the biggest shakeups in talk radio history, a source close to the show tells POLITICO.

Should the move take place, 40 Cumulus-owned radio stations would lose the rights to the most popular talk radio program in the country. In addition, the show might be picked up by competing regional radio stations in Washington, New York, Chicago, Dallas and other major markets.

(PHOTOS: Cartoons of Rush Limbaugh)

According to the source, Limbaugh is considering the move because Cumulus CEO Lew Dickey has blamed the company’s advertising losses on Limbaugh’s controversial remarks about Sandra Fluke, the Georgetown law student. In Feb. 2012, Limbaugh referred to Fluke as “a slut” because she had called on congress to mandate insurance coverage of birth control. The subsequent controversy over those remarks resulted in a significant advertising boycott.

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