Because the Catholic Church opposes abortion as a matter of doctrine, some Catholic bishops have refused or threatened to refuse communion, or threatened to declare excommunication upon Catholic politicians who support abortion. In some cases, officials have stated that ministers should refuse communion to such politicians per canon 915 of the 1983 Code of Canon Law; elsewhere, that the politicians should, on their own, refrain from receiving communion ad normam canon 916; and in other cases, excommunication has been suggested.