They haven't for a long time, just that most of the time they were doing things we thought was for good (EPA, civil rights act, controlled substance act, etc) and we thereby entered a post-constitutional world to let that stuff slide by despite the 10th amendment limiting the federal powers to enumerated powers.

Eventually we got used to letting the feds slide on all the good things to the point everything was just operating on slick ice, and people like Trump just pushed it to the next logical step which is to also use the post-constitutional world to his own personal advantage and for gross tyranny against the populace.

If civil rights are unconstitutional, you don't have a country.