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. ש"פ חיי שרה תשמ"ט - סעיפים ח-י
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.