SEATTLE, Wash. — Seattle and other government agencies have filed a lawsuit to halt the $30 car tab measure passed by voters statewide this month.

KING 5 reports the suit was filed Wednesday by the city of Seattle, King County, Port of Seattle and several other groups.

The suit calls I-976 “a poorly drafted hodge-podge that violates multiple provisions of the Constitution, including the Single Subject Rule.”

That rule prohibits ballot measures from containing more than one subject.

Initiative sponsor Tim Eyman called the suit a “slap in the face” to voters.