Interest and action are separate. There was interest, so action was taken. Was the mechanism controversial? The mechanism, a law passed by the legislative body and upheld by the court seems like any other law. That's the qualifier in the US Constitution to know if it is constitutional or not.
So this is the sort of statement that needs to be whacked a couple of times with a rolled-up newspaper.
The US government does not have a vested interest in doing things expressly prohibited to it by its own constitution.