Universal health care, by some definition of the term, has certainly been proposed. A system of single-payer health care, with all medical providers either (1) limited to the amount of compensation authorized by Medicare or some equivalent or (2) required to work for a government entity of some sort has not, by any major political candidate or main-stream political party. If I am incorrect, please refer me to a creditable source for verification otherwise. I will readily admit that there may have been such suggestions made by entities on the idiot fringe.