Article 1, section 8 of the U.S. constitution details the exact powers granted to congress to legislate. Using good reading comprehension, the beginning of that section list the term "provide for the general welfare." Yes, to make legislation that is restricted to parameters listed in section 8, that does provide for the general welfare. If it isn't an authority granted to the United States, it is reserved to the states or the people. (10th amendment)
The supreme court, who is partisan, can decide as they wish..... doesn't make them right. If we had a legislature, executive, and judiciary with guts, this nation wouldn't be at the mercy of popular sentiments. The U.S. is a republic by design, nothing is supposed to happen for long periods of time.
Read the federalist. The U.S. is nothing more than a trade and defense union of several different states.
The progressives of the early 20th century, got the 16th and 17th amendments through. Turning the fed into a political machine. It's time for this to go.