This is just my hunch. If you want to see what type of bills and amendments have been attempted, just google "personhood amendment" or "heartbeat bill".

It really does seem to be their go-to method. And, to me, this seems to be the best way to get rid of abortion. If they get their way and this sort of thing becomes an amendment, abortion and contraception would be outlawed for generations, if not forever. Why go for something that could be potentially overturned if the Supreme Court turns liberal when you can enshrine something in the Constitution? It's much more difficult to repeal amendments.