In a letter dated 5729, the Rebbe reiterates his opinion against abortions in Eretz Yisroel.
At a Farbrengen dated 5749 the Rebbe put forth the idea that when two sides of the government are in disagreement, unable to establish a coalition (as was the case at the time in Eretz Yisroel), there can be a common ground where they can meet. This could be done by starting with reinforcing previous laws that have been neglected, such as the law against abortion.
The Halacha varies in context of levels of danger to the mother and stage of the pregnancy.
Therefore, it is imperative to consult a Rov in all cases, whether is seems to be a case where one should be maikel or machmir.