Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) on Thursday ripped the Republican plan to repeal ObamaCare ahead of a House vote, saying millions would lose health insurance if the bill becomes law.

"How can you call something 'health care reform' when millions of people lose their health insurance?" Sanders wrote on Twitter.

How can you call something "health care reform” when millions of people lose their health insurance? — Bernie Sanders (@BernieSanders) May 4, 2017

The House is poised to vote Thursday on an amended version of the American Health Care Act (AHCA), which repeals significant parts of former President Obama's signature healthcare law. Among other provisions, the bill would allow states to waive ObamaCare's rule prohibiting insurers from charging customers with pre-existing conditions more for coverage.

The bill would set aside $8 billion over five years to help people with pre-existing conditions purchase health insurance.

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Still, Congress's scorekeeper, the Congressional Budget Office (CBO), has yet to weigh in with an assessment of how much the GOP plan would cost and how many people could lose coverage under the measure.

The initial version of the AHCA received a grim review by the CBO, which estimated that, while it would ultimately trim money from the federal deficit, it would leave 24 million people uninsured over the next 10 years.

That measure was pulled from consideration in March amid dwindling support from Republicans.

The amended version of the bill, however, has drawn more support among moderate and conservative Republicans, who initially opposed it. House Majority Leader Kevin McCarthy (R-Calif.) on Wednesday said that the new bill had enough votes to pass the House.