The Federal Government's Authority Over Your Healthcare
The federal government has the right to prevent you from contracting with any agency for health insurance. In other words, you do not have the right to form contracts with another party for the purpose of health insurance coverage unless the federal government gives you that right.
You do not have a right to refrain from purchasing health insurance. If you fail to purchase it, you may be held to be in violation of the law if the federal government so desires. The federal government will then have a right to punish you and force you to purchase health insurance.
American insurance companies may rightfully be prevented from offering health insurance coverage by the federal government. They have no right to offer it if the federal government does not give them such a right.
If the federal government chooses to do so, it may rightfully put private insurance companies out of business by undercutting their premiums by selling federal government insurance policies at a loss. That's legal. The federal government may use such tactics to create a monopoly. It has such a right.
When there is only one insurance company left, the federal government, it will have a right to deny its customers medical treatment. As in Canada and England, the American federal government has a right to withhold medical treatment from its customers.
The federal government can afford to create another federal health insurance program at this time.
In short, rights come from somewhere: the federal government. And money comes from nowhere.