"The Lawfulness of Section 5 — and Thus of Section 5"

 its opponents claim that targeting some states and not others goes beyond Congress’s powers to remedy discrimination

And, then we get an article.  This deals with (with cause) the broadest claim.  The narrower one is that they can but there has to be a suitable fit, which allegedly no longer requires (allows) the preclearance provision as written.  Not sure if this always comes through.