The amendment was adopted during the Fine Gael–Labour Party coalition government led by Garret FitzGerald, but was drafted and first suggested by the previous Fianna Fáil government of Charles Haughey. The amendment was supported by Fianna Fáil and some of Fine Gael, and was opposed by the political left. Most of those opposed to the amendment insisted that they were not in favour of legalising abortion. The Catholic hierarchy and many lay Catholics supported the amendment, but it was opposed by the authorities of other mainstream churches. After a bitter referendum campaign, the amendment was passed by 67% voting in favour to 33% voting against.