Article V is likely the loophole he saw. It is however monumentally hard to amend the constitution even with the extreme gerrymandering of today. I was surprised it has actually been done once within my lifetime but I doubt it will happen again without a cataclysmic change of public opinion.
m-hodges|6 months ago
¹ https://www.newyorker.com/magazine/2017/03/13/republicans-an...
² https://documents.ncsl.org/wwwncsl/Elections/Legis_Control_0...
³ https://documents.ncsl.org/wwwncsl/About-State-Legislatures/...