Earlier this year, two Arizona bills to make it more difficult for initiatives to get on the ballot were signed into law. HB 2404 outlaws paying circulators on a per-signature basis, and HB 2244 says initiatives should not get on the ballot unless every technical requirement for the petition is strictly followed. According to this story, groups who support the initiative process have begun referendum petitions against both bills. If opponents of these bills collect 75,321 valid signatures, the two bills will not go into effect immediately and the voters will judge these laws in the November 2018 election.
The referendum petition against HB 2404 is due in late July, and the referendum petition against HB 2244 is due in early August. Here is a Tucson editorial condemning HB 2244 and HB 2404.