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The US Senate has voted in favour of drafting a bill to repeal the outgoing President's flagship health insurance scheme known as Obamacare.
Under the programme – signed into law by Barack Obama – around 20 million previously uninsured Americans gained health coverage.
The US Senate resolution, which was passed by a 51-48 majority, will be voted on in the House of Representatives on Friday.
Republicans in both chambers have said that scrapping the Affordable Care Act, also known as Obamacare, is a top priority for them.
President-elect Donald Trump has called the scheme a "catastrophe" which had to be overhauled "very, very quickly".
During a press conference on Wednesday, he said he would replace Obamacare with legislation to "get health care taken care of in this country".
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However, efforts to a draw up a replacement scheme have stalled.
Ahead of Friday's vote in the House of Representatives, Republican congressman Tom MacArthur said he opposed plans to push forward the repeal of the Act.
He said: "We're loading a gun here. I want to know where it's pointed before we start the process."
Republican senator Susan Collins warned her party would risk "people falling through the cracks or causing turmoil in insurance markets" if it repealed Obamacare without putting a replacement scheme in place first.
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Meanwhile, Democratic senator Bernie Sanders claimed Republicans "have no idea how they are going to bring forth a substitute proposal".
As well as extending health insurance to millions, Obamacare prevented insurers from denying coverage for pre-existing conditions and funded the Medicaid health programme for the poor.
Since it was signed in 2010, Republicans have launched repeated efforts to repeal the Act.
Republican senator Thad Cochran claimed it had "limited choice, increased costs and diminished access to healthcare" across the US.