Ahead of the debates, California Senator Kamala Harris has released her healthcare proposal, which would allow individuals to buy into Medicare and slowly expand the system over 10 years. Her plan would keep private insurance in the marketplace but require that those plans adhere to standards and costs set by Medicare.

Bernie Sanders’s campaign quickly slammed Harris’s plan, saying it is “centered around privatizing Medicare, enriching insurance executives and introducing more corporate greed and profiteering into the Medicare system.” Bernie Sanders is calling for a single healthcare system, run by the government, that would essentially do away with private insurers.