Tucson may be on its way to becoming Arizona’s first sanctuary city.

Arizona officials have verified the needed signatures, thousands of them, that will place the initiative on the ballot. On Monday, more than 12,400 signatures have been certified by the Pima County Recorder’s office. That is 3,100 more than the initiative needed to be included on the ballot for the November election.

The Republican Party in Pima County plans to challenge the signatures’ validity, but they have not filed a lawsuit.

If approved, the initiative will add protections for those who are living in the U.S. illegally. It will prevent the Tucson police from asking people their immigration status, and it will prohibit certain types of cooperation between city and federal agencies.