In December of 1973, the Supreme Court made one of its most controversial (and worst) rulings, Roe v Wade. It declared that the Constitution protects abortion; therefore, the states could not pass restrictions on it. However, states could pass laws to limit abortions in the third trimester.
Despite this, Republicans in numerous states have recently passed laws with very strict restrictions on abortion. Clearly, this is an attempt to get a lawsuit and with it, a case to the Supreme Court. Hopefully, this will lead to the Supreme Court overturning Roe v Wade, once more leaving the issue to the states.