Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.) on Thursday ripped the Senate's current healthcare battle as "totally bananas," accusing Republicans of upending the "regular order" of the chamber's business.

"There has not been one public hearing on a bill that impacts one-sixth of the American economy and every single American," Sanders said during an appearance on CNN.

"You have a process in which the bills being brought forth are opposed by the American Medical Association, the American Hospital Association, the AARP — every major healthcare organization in America — and they're trying to push this thing through."

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Senate Republicans voted on Tuesday to open debate on efforts to overhaul the country's healthcare system, setting off a series of back-to-back votes on amendments.

Democrats, however, have refused to offer any amendments until a final bill is unveiled.

Senate Republicans hit another snag on Thursday, when three GOP senators said they would not vote for a so-called "skinny" repeal of the Affordable Care Act, unless the House guaranteed that a more comprehensive healthcare bill would be hammered out in conference.

The "skinny" bill repeals certain provisions of ObamaCare, such as the individual and employer insurance mandates, while leaving intact other pieces of the law, like the Medicaid expansion.