Georgia is going after the Department's objection to their citizenship verification procedures.  Georgia implemented rules to ensure that only citizens are registered to vote and the Justice Department blocked implementation, wielding power under Section 5 of the Voting Rights Act.  Georgia in this complaint is going after both the objection but also the statute underlying the objection - Section 5.

This case is now the third active attack on the Constitutionality of Section 5 of the Voting Rights Act.  Section 5 is on the outer frontier of the permissible exercise of federal power over the states.  The other cases are from Kinston (NC) and Shelby County (AL). 

I expect more cases to follow this one.