They already have. I have posted this before and they defended it.
• "If you can’t take care of your sick in the country, forget it, it’s all over. ... I believe in universal healthcare," ~ liberal Donanld Trump
• "I would put forth a comprehensive health care program and fund it with an increase in corporate taxes" ~ liberal Donald Trump
• "The Canadian plan also helps Canadians live longer and healthier than America. … We need, as a nation, to reexamine the single-payer plan, as many individual states are doing." ~liberal Donald Trump
BUMP
and that is still his position as of a month ago