That would be Trump's pro-abortion sister, whom he thinks would be a "phenomenal" Supreme Court justice.
That is an unfortunate aspect; but not a deal-killer; the problem is the secularized culture in which voters have allowed abortion to remain legal so they may practice their Marxist sex. We need a religious revival, but a president cannot bring that about. The the topic at hand was the claim that Trump had no idea whatsoever of Constitutional law. Just because he sounds like a Brooklyn pipefitter doesn't mean he is unable or unwilling to understand the fundamentals of our system. To make an analogy, he has had to master reading blueprints although he isn't an architect or engineer. He knows what a foundation is, and that the Constitution is our national blueprint. (Just an analogy; not an invitation to split hairs over the difference between a blueprint and a legal document...)