I think he meant liberals are much more likely to be triggered by this than conservatives are, since they don't think women should be forced to carry a baby to term for ANY reason, let alone when there are life-threatening defects present.
Abortion should be available to all women, but it should /not/ be used as nothing more than a late-stage contraceptive just because she doesn't like the feel of condoms, or wants to be able to still wear a bikini.