It was not a loaded question. The question was simple, Trump have the right answer, and then after consulting with his handlers, walked it back.
Of course it was a loaded question. The truth is the chance of abortion being illegal under federal law is remote at best. If Roe v. Wade were overturned it would be a state issue most likely. Congress would have to pass a law, and whether it would criminalize the woman or just the doctor would be up to the lawmakers. So why ask Trump? Have they asked Kasich or Cruz? Have they asked Hillary or Bernie whether they would enforce such a law? No. Trump needs to learn to not answer such idiotic hypothetical gotcha questions though.
Cruz giving a well thought out answer:
““Once again Donald Trump has demonstrated that he hasn’t seriously thought through the issues, and he’ll say anything just to get attention. On the important issue of the sanctity of life, what’s far too often neglected is that being pro-life is not only about the unborn child; it’s also about the mother—and creating a culture than respects her and embraces life. Of course, we shouldn’t be talking about punishing women; we should affirm their dignity and the incredible gift they have to bring life into the world.”