Manhattan federal prosecutors Friday mocked former state Assembly Speaker Sheldon Silver's claim that corruption charges against him do not involve criminal conduct and urged a judge to reject the political power broker's bid to have the case dismissed.

Silver was accused in January of doing favors for a doctor and real estate developer to generate business for a law firm that paid him referral fees, but has claimed that the schemes weren't a federal crime because New York legislators are allowed to make outside income, and his benefits were indirect.

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"Bribes, kickbacks and extortion are just as illegal in New York as they are in every other state ... whether or not the money is passed to Silver as cash in a suitcase or conveniently disguised as a lawyer's referral fee," prosecutors responded Friday.

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Silver, 71, resigned as speaker but continues to represent his Manhattan Assembly district.

U.S. District Judge Valerie Caproni has not signaled when she will rule on the motion to dismiss.