This is a super smart (election wise) position to take and I have been saying for months and months now that the R's needed to do exactly this. Even gave
@blazers credit that R's were losing mid-terms and special elections on this point. This would completely take the wind out of their sails.
Regarding "Liberals are going to hate Trump for this"? I think that's a given, hate is hate, and libs' position remains consistent, haha. I think the better question is whether it impacts the super conservative evangelicals and looses numbers from them.
As a footnote, I have a hard time with the rape/incest exception that so many want to sit the fence on. Philosophically speaking, a life is a life is a life. At whatever point one can decide that a clump of cells has become a life, it doesn't matter that it was created in a happy, planned, and traditional church sanctioned marriage or was the result of one of the most vile and degusting acts imaginable. Politically I get it. But, the life, whenever it is a life, is still a life regardless of the intent behind its creation.