Nationalizing the health care system is almost certainly unconstitutional, with the current SCOTUS it is certainly unconstitutional. Were such legislation to somehow make its way through congress and get signed 25 states would immediately sue, would get restraining orders and the whole mess would grind for years through the courts like the current bogus challenge to the ACA.

What about Medicare you ask. That seems to be constitutional. Two massive differences between Medicare and MFA. First and most importantly, NOBODY wants to insure seniors, who make up the bulk of medical spending though they are a minority of the population. The numbers just don't work, no profit to be made.

And second, Medicare relies almost entirely on private providers. To nationalize our providers you have to ban their businesses, and there simply is no constitutional way to do that, not to hospitals, clinics, or doctors, not to insurance companies.

We DO have a current way to soak the profit out of the insurance industry...It's called the ACA, otherwise known as Obamacare. Obamacare already regulates the profit and overhead of Marketplace insurers, and nobody has challenged the constitutionality of THAT regulation. Given the power to regulate profit and overhead the door is wide open to regulate them down to Medicare levels, at which point the "for profit" argument becomes moot.

As to the current SCOTUS challenge to the ACA, they will rule that the mandate is severable and toss the suit.