COLUMBUS, Ohio (AP): Legal fireworks continue over a proposal that seeks to control the price Ohio pays for prescription drugs.

The Drug Price Relief Act aims to keep state entities from buying drugs at prices higher than the U.S. Department of Veterans Affairs pays.

Opponents including the Ohio Manufacturers’ Association and the Pharmaceutical Research and Manufacturers of America sued. They argue in an Ohio Supreme Court filing Wednesday that petition circulators failed to follow Ohio law and certain signatures should be tossed.

The issue’s backers, led by the California-based AIDS Healthcare Foundation, were cleared June 4 to begin gathering signatures to take the plan to voters. That was after state lawmakers failed to act within four months on what’s called an initiated statute.

Proponents face a July 6 signature deadline for fall 2016.