The owners of a wedding chapel in Coeur d'Alene, Idaho have filed a federal lawsuit claiming that the city is forcing them to violate their religious beliefs by performing weddings for gay and lesbian couples.

City leaders last year approved a gay-inclusive anti-discrimination ordinance which applies to the areas of housing, employment and public accommodations.

While religious entities are exempt, The Hitching Post is a for-profit business run by Donald and Evelyn Knapp.

City attorney Warren Wilson in May told The Spokesman-Review that the chapel would have to comply with the law if marriage equality became legal in the state, which happened last week.

Violators face a misdemeanor charge punishable by fines and jail time.

The Knapps, who are being represented by the Christian conservative legal group Alliance Defending Freedom (ADF), are ordained ministers with the International Church of the Foursquare Gospel, a Protestant evangelical Pentecostal Christian denomination founded in 1932. They began operating The Hitching Post in 1989.

“On October 17, 2014, the Knapps invoked their religious beliefs and ordination vows and declined to perform a same-sex wedding ceremony,” the lawsuit states. “Because of the immediate and irreparable harm the Knapps are suffering to their constitutionally protected rights, they urgently need this Court to issue a temporary restraining order enjoining [the ordinance] as applied to them.”

Coeur d'Alene Mayor Steve Widmyer told The Spokeman-Review that he was unaware of the lawsuit.