Paul Ryan, the top Republican in Congress, said he had full confidence in Devin Nunes, who heads the House of Representatives intelligence committee and is under fire for his handling of an investigation into possible Russian ties to Trump's aides.
Trump administration yet to endorse the Republican legislation. Former US president Barack Obama's Affordable Care Act enables about 20 million previously uninsured people to get medical coverage.
President-elect Donald Trump, Republicans and Democrats condemned the planned move which was spearheaded by Republican representatives, some of whom are under investigation by the committee.
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