PHOENIX — Phoenix officials are pursuing a measure to take so-called dark money out of city elections.

The Arizona Republic reports the city council on Wednesday voted in favor of exploring a change to city charter, seeking to stop the local use of campaign donations that are made to political nonprofits, which are not required to disclose donors.

Mayor Greg Stanton and council members Kate Gallego and Debra Stark had requested city staff to draft an amendment that requires groups to disclose the sources of money used in city elections.

The council will need to vote on the amendment after it is drafted. It would then go before Phoenix voters.

Tempe residents will vote next week on a similar proposal, which requires groups involved in city elections to disclose financial backers.

Information from: The Arizona Republic,