Illinois lawsuit accuses McDonald's of misrepresenting what's really inside a McRib sandwich

CHICAGO -- McDonald's is pushing back against a class-action lawsuit that claims its McRib sandwich "misleads" the public.

The court filing in Illinois accuses the fast-food company of misrepresenting what's really inside the McRib patty.

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It says the chain uses "lower-grade pork" or meat byproducts and not any actual pork rib.

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McDonald's refutes those accusations, telling USA TODAY the lawsuit "distorts the facts," and insists the McRib is made of boneless pork.

The class action suit seeks damages and a change in McRib advertising, but details weren't given.

The McRib returned to McDonald's on Dec. 3 for a limited time.

For the first time, customers can also purchase a jug of the iconic sauce thanks to a new limited-time, online-only drop for A Whole Lotta McRib Sauce.

ABC News contributed to this report.