You can kill a baby after it is born and lie and say "it was an abortion". I've seen a video where a doctor was advising that the mother give birth, and then they have a conversation about what to do about the baby, and if they choose they kill it after birth. That was what Trump was referring to.
That doesn’t happen
If you want to know the truth, search for the video. I don't have time to educate you.
I can't find the video, but it was spread around right-wing circles at least a few years ago. Nonetheless the concept is pushed for by some: https://en.wikipedia.org/wiki/After-birth_abortion I don't think it happens often, and I'm not taking a side on whether or not it would be a good thing in some cases.
You know it does. It may be rare, but it likely happens more than we want to admit.