"What are the Constitutional grounds for the Federal government to get involved in this issue, particularly in light of the Tenth Amendment?"
Mind you I hope there are some really substantive ones, because I think that reining in the trial bar is a wonderful idea.
But unfortunately conservatives fall prey as often as liberals to the delusion that every wonderful idea is best brought to fruition in the legislature.
One more thing.....
Is it really a treat to beat your feet in the Mississippi mud?
Fair enough question, but if I remember my Civic lesson from high school Mullberry was decided by the Supreme Court that when trades crossed state lines, it became an interest to the Federal Goverment.
If a class action suit involves parties across state lines then the Federal Goverment has some interest.
...but as I am not a lawyer, and I don't play one on TV, I may be wrong.