SEATTLE (AP) — The U.S. Supreme Court has declined to hear a challenge to Seattle’s first-in-the-nation “democracy voucher” program for public financing of political campaigns.

The high court issued its denial Monday in a challenge brought by two local property owners who said the program forces them — through their tax dollars — to support candidates they don’t like.

Seattle voters decided in 2015 to tax themselves $3 million a year; in exchange, each receives four $25 vouchers that they can donate to participating candidates in city elections. The Washington state Supreme Court has already unanimously upheld the program.