In a 2016 paper, Amy Coney Barrett described the Fourteenth Amendment as "possibly illegitimate."

The Fourteenth Amendment requires due process and equal protection, and has served as the basis for such Supreme Court decisions as Brown v. Board, Roe v. Wade, and Obergefell.

This should be disqualifying. The Fourteenth Amendment, in addition to providing for due process and equal protection, is what applies the Bill of Rights to the states. It was passed shortly after the Civil War as a necessary corrective for a Constitution that condoned slavery.

To suggest that the Fourteenth Amendment is "possibly illegitimate" is to suggest that all people are not equal under the law. It is a rejection or more than a century and a half of progress towards greater civil rights.

This should raise as many alarm bells as when Amy Coney Barrett suggested that the right to vote and serve on juries can be limited to only virtuous decisions. The full paper can be found here: https://scholarship.law.upenn.edu/cgi/viewcontent.cgi?article=1619&context=jcl