[Libertarianize the GOP]

How could it be settled in the courts? I thought the legislative branch was the only one with the power to enact.

Where would you take a challenge as to whether the 16th amendment was legally ratified?

[ancient_geezer]

Where would you take a challenge as to whether the 16th amendment was legally ratified?

Congress and the States, who are the only parties to amending the Constitution per Article V.

Now if a state were to bring suit in the courts, that would be a different kettle of fish, for they have the necessary standing to bring such a suit.

Interestingly, inspite of the claims going around of the 16th having not been legally ratified, no state nor any legislator ever brought such a suit to the courts or ever made the claim that the 16th amendment, as officially, published was not what they intended or ratified in their legislatures.