Archbishop Allen Vigneron of Detroit has taken the highly unusual step of mailing a letter to every Catholic registered in the parishes of the archdiocese, urging them to vote against a ballot initiative should would broaden access to legal abortion.

In his letter, sent to hundreds of thousands of Catholic households, the archbishop said that the “vast and extreme” expansion of abortion could “transform Michigan into ground zero for for abortions performed anywhere, at any time, by any person, for any reason.”