(CN) — A conservative think tank on Thursday asked a 10 th Circuit panel to revive its claim against a city’s requirement that donors contributing over $250 to ballot measure campaigns must be disclosed. As a super-sized debate bubbled up around a proposed soda tax in 2017, Albuquerque-based Rio Grande Foundation sued the city of Santa Fe over an ordinance requiring donor disclosure by groups spending more than $250 to advocate for ballot measures. With proponents of the proposed 2-cent-per ounce tax on sugary beverages backed by billionaire Mike Bloomberg, groups on both sides spent nearly $2 million. Ultimately voters rejected the measure by more than 15 points.