They said “originally”, i.e. before the 14th Amendment, which contains the due process clause. Edit: There’s also a “due process” clause in the Fifth Amendment

They said “originally”, i.e. before the 14th Amendment, which contains the due process clause. Edit: There’s also a “due process” clause in the Fifth Amendment, but it’s not the one used for incorporation (although it’s been used for so-called “reverse incorporation”).