As FoxNews.com reported, Sanders' single-payer health care plan would make - in the democratic socialists' words - healthcare a "right and not a privilege," by shifting the funding responsibilities to the government from the individual.
However, tape from 1987 shows Sanders warning of the fiscal perils that a "Medicare-For-All" plan would bring, as reported by the Washington Free Beacon.
He said that, at the time, he took a look at Canada's national health service, which provides government health care to all Canadians.
"The way I see it, you want to guarantee that all people have access to health care as you do in Canada," Sanders said.
"But I think what we understand is that unless we change the funding system and control mechanisms in this country to do that... we would be spending such an astronomical amount of money that we would bankrupt the nation."
He said that the government in Ottawa gives access "to all people" at a lesser per-capita cost than the same system would in the United States.
Sanders' 2017 single-payer plan was immediately greeted with praise from New Jersey Sen. Cory Booker (D), New York's Kirsten Gillibrand (D) and other possible 2020 presidential contenders.