US President Donald Trump on Thursday told Republicans to back his plan to repeal and replace Obamacare or lose all opportunity of reforming it, US media reported.

Trump issued the ultimatum after the US House of Representatives cancelled a planned vote on the bill on Thursday when around two dozen conservatives refused to back it.

Repealing and replacing Obamacare, former president Barack Obama's signature health care policy which passed in 2010, had been one of the top campaign pledges made by Trump and other Republicans during last year's election.

Trump's demand was made by his budget director Mick Mulvaney at an evening meeting of House Republicans, according to the New York Times.

The newspaper reported that House Speaker Paul Ryan came out of the meeting and told reporters that Trump would get the vote he wanted on Friday, though he refused to answer questions about whether the measure would pass.

The bill to overhaul Obamacare, officially known as the Affordable Care Act, ran into problems earlier Thursday when it faced opposition not only from Democrats, but from more than 20 hard-line Republicans and a handful of the party's moderates.

The deficit in support came despite vigorous lobbying by Trump. The president reportedly coaxed and threatened Republicans earlier this week to vote for the reforms or face political consequences, according to the New York Times and the Washington Post.

None of Obama's left-leaning Democrats is expected to support the House measure.

Nancy Pelosi, leader of the minority Democrats in the House, needled Trump, a political novice who touts his negotiating skill and once published "The Art of the Deal," a book of business strategies.

"Donald Trump: You may be a great negotiator," she said Thursday. "Rookie's error for bringing this up on a day when clearly you're not ready."

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