Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.), a 2020 presidential candidate, defended one of his signature policy proposals, Medicare for All, on “Fox News Sunday,” saying Medicare is “far more popular” than private insurance.

“Medicare itself is far, far more popular than our private insurance,” Sanders told Fox’s Chris Wallace Christopher (Chris) WallaceGOP lawmakers distance themselves from Trump comments on transfer of power Trump mocks Biden for calling 'a lid' before 9 a.m. Trump claims Fox anchor Chris Wallace won't ask Biden 'tough questions' at debate MORE. “People don’t like insurance companies, they like their doctors and they like their hospitals.”

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Asked about estimates that put the cost of a Medicare for All program at up to $32 trillion, Sanders responded “It sounds like a lot of money, but you know what happens if we keep the current system? There are estimates the cost will be $50 trillion.”

“What we are talking about is allowing all of the American people to continue going to the doctor they want to go to,” Sanders added. “Every study shows Medicare for All will be less expensive than continuing the current dysfunctional health care system.”

Asked whether he still believes in proposals he made as mayor of Burlington, Vt., for public ownership of major industries, Sanders demurred, but added that in the U.S., “power in this country rests with just a handful of people… six institutions control the flow of trillions of dollars.”

Earlier this month, Sanders acted as a proxy for Walmart workers at the retail giant’s annual shareholder meeting, introducing an ultimately unsuccessful proposal that would have given workers a seat on the company’s board.