Paul Hsieh in an op-ed. Thankfully, none of the major presidential candidates are proposing such a system:
To guarantee “free” health care, a government must force the individual to pay for everyone else’s medical care and limit his freedom to pay voluntarily for his own. With bureaucrats deciding who receives what, the individual is therefore forbidden from spending his money according to his own rational judgment (and the advice of his doctors) as to what’s best for his health. When a government forces people to act against their own interests, it’s no surprise that the results are misery and death.