Two law professors active in the Federalist Society wrote that the original meaning of the 14th Amendment makes Donald Trump ineligible to hold government office.
When you've got an outdated document as the backbone of your whole legal system, you kinda have to re-re-interpret everything, no matter what. Originalists tend to be pretty conservative, it's just a method of thinking that allows conservative lawyers/judges/legal people to slap some legitimacy onto their interpretations. It's an alternative to the modern (centrist) interpretation of law in the US, which has in recent years allowed for things like gay marriage. However the flavor of conservatism is very "traditional" compared to the modern alt-right, meaning they are also often anti-trump.
That is technically what the amendments are, but it's so much harder to push an amendment through congress than it is to just argue that the constitution already agrees with what you want to happen
Especially since the "originalists" are being quite disingenuous. They've wanted for quite a while to start a new Constitutional Convention to rewrite the thing from scratch. They don't really respect the founders as much as we think they do. They want to become the new founders, and force their great-great-grandchidren into boxes they make.
Agreed, and if they re-interpret the Constitution completely from the original meanings you might even revive slavery. Well, surely they can't, and that shows how arbitrary the originalist position is.