TDs have passed the second stage of the Protection of Life During Pregnancy Bill by 138 votes to 24 in this evening's Dáil vote.
Four Fine Gael TDs voted against - Peter Mathews, Billy Timmins, Brian Walsh and Terence Flanagan.
All four will now be expelled from the Fine Gael parliamentary party.
A series of other Fine Gael TDs who have problems with the bill, including junior minister Lucinda Creighton, voted in favour of it for now but could break ranks later.
Sinn Féin's Peadar Toibin also voted against the bill, as did 13 out of the 19 Fianna Fáil TDs.