The US Senate has taken a first concrete step toward dismantling Obamacare, voting to instruct key committees to draft legislation repealing President Barack Obama's signature health insurance program.
The vote was 51-48. The resolution now goes to the House of Representatives, which is expected to vote on it this week.
Scrapping the Affordable Care Act is a top priority of the Republican majorities in both chambers and Republican President-elect Donald Trump.
Republicans have said that the process of repealing Obamacare could take months, and developing a replacement plan could take longer.
But they are under pressure from Mr Trump to act fast; he said yesterday that the repeal and replacement should happen "essentially simultaneously".
About 20 million previously uninsured Americans gained health coverage through the Affordable Care Act.
Coverage was extended by expanding Medicaid and through online exchanges where consumers can receive income-based subsidies.
Republicans have launched repeated legal and legislative efforts to unravel the law, criticising it as government overreach. They say they want to replace it by giving states, not the federal government, more control.
But in recent days some Republicans have expressed concern about the party's current strategy of voting for a repeal without having a consensus replacement plan ready.
House Speaker Paul Ryan said this week he wants to pack as many replacement provisions as possible into the legislation repealing Obamacare.
But Senate Finance Committee Chairman Orrin Hatch, also a Republican, said this could be difficult under Senate rules.
The resolution approved this morning instructs committees of the House and Senate to draft repeal legislation by a target date of 27 January. Both chambers will then need to approve the resulting legislation before any repeal goes into effect.
Senate Republicans are using special budget procedures that allow them to repeal Obamacare by a simple majority; this way they do not need Democratic votes.
Republicans have a majority 52 votes in the 100-seat Senate; one Republican, Senator Rand Paul, voted no.
Democrats mocked the Republican effort, saying Republicans have never united around an alternative to Obamacare.
"They want to kill ACA but they have no idea how they are going to bring forth a substitute proposal," declared Senator Bernie Sanders of Vermont.
Mr Trump said yesterday he would submit a replacement plan as soon as his nominee to lead the Health and Human Services department, Representative Tom Price, is approved by the Senate.
But Mr Trump gave no details.
Democrats passed the Affordable Care Act in 2010 over united Republican opposition. Democrats say the act is insuring more Americans and helping to slow the growth in healthcare spending.
But Republicans say the system is not working. The average Obamacare premium is set to rise 25% in 2017.
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