Can't muzzle free speech, but you don't have to open a debate on the issue. he can jabber all he wants as an MP. it's not party policy. There were 12 Liberal MPs and senators who tried to introduce anti abortion legislation as well.
http://www.arcc-cdac.ca/presentations/anti-bills.htmlIt's a pretty divisive issue and as the link I posted points out, the last government sponsored bill was narrowly defeated in the senate. Pro choice doesn't mean you are pro abortion it just means you support the ability to choose that option. Many who are pro choice would never make abortion their choice, like my wife and myself. However, we don't have the right to deny others their right to choose, whether we disagree with it or not.