He said nothing about allowing nationwide sale of health insurance. Right now, only insurance companies licensed by the state can sell insurance in that state. Few insurance companies have the time, money, and lawyers to get licensed in all 50 states. So us patients are limited in our choice of insurance company to the few that operate in the state we live in.
We could pass a federal law allowing any insurance company licensed by one state to sell insurance in every state. This would increase competition between insurance companies, and lower premiums. And not raise our taxes at all.