Currently, Canada has no restrictions on abortions whatsoever.
It's likely that one of the following two types of abortion restricting bills could be passed.
A bill to restrict late term abortions:
Granted, it would be hard to find a doctor to perform an abortion at 8 1/2 months, but if a doctor is agreeable to it, it would be legal.
A bill to restrict sex-selective abortions
These happens often in other countries, and they are starting to happen more frequently in Canada.
While you may or may not agree with restricting these types of abortions, to suggest that any politician who would like to vote for either of these restrictions is not worthy of representing the Liberal party is a bit much.
Trudeau (despite being nominally Catholic) fails to realize that Catholics are generally quite progressive (the only religious group in the US to vote more than 50% for gay marriage), but there is a limit to how far they can be pushed. He just handed a big chunk of voters over to the Conservatives to take a stand over something that didn't require one.