The President cannot amend the Constitution. Congress cannot by itself. The legislatures of the States cannot, by themselves. Only 2/3 of both houses of Congress and 3/4 of the state legislatures (or convention alternatives) can do that, according to Article V of the Constitution. The Founders made it very difficult on purpose, as our fundamental law should rarely change, and only if there is a genuine consensus to change it.
But does the American Association on Intellectual and Developmental Disabilities (AAIDD), a private organization that the people have no voice in selecting, have the power to amend the Eighth Amendment by itself and widen the class of people that amendment (the Supreme Court says) exempts from capital punishment regardless of how horrible the crime or how clearly premeditated it was? That is one possible interpretation of the Supreme Court’s misguided 2017 decision in Moore v. Texas. See this post. The Supreme Court today turned down a case, over the dissent of Justices Sotomayor, Breyer, and Kagan, presenting that question. Continue reading . . .