LINCOLN, Neb. (AP) — Groups that want to legalize casinos at Nebraska horse racing tracks are teaming up for another effort.

The Omaha World-Herald reports that the Nebraska Horsemen’s Benevolent and Protective Association and Ho-Chunk Inc. announced Wednesday that they would seek to place the issue on the 2020 ballot. The effort would involve gathering tens of thousands of signatures beginning next year.

If the effort succeeds and voters approve it, casino gambling would be allowed at racetracks in Omaha, Lincoln, Grand Island, Columbus, South Sioux City and possibly Hastings.

A similar attempt to place the question on the November 2016 ballot ended with a shortage of signatures and a lawsuit against the company circulating petitions.