This is not a policy shift:
Trump: I am For the Exceptions on Abortion: Rape, Incest, Life of the Mother - August 11, 2015
The only new thing here is that he supports a change to the party platform.
Trump has repeatedly said he was for exceptions and then tells you Ronald Reagan had the same exceptions, which he did when he first ran, but during his second term was 100% pro-life with no exceptions.
How does that make this position of his any better (or less reprehensible)?
I agree with Donald on this. So did Ronald Reagan.
Saving Life of mother is the priority. However rape definition is squishy these days. Forcible rape yes allow statutory rape no disallow.
Incest is almost always forcible rape of a minor. Allow.