British Prime Minister Theresa May's final Brexit gambit is in tatters just hours after her offer of a vote on a second referendum and closer trading arrangements failed to win over opposition lawmakers or many in her own party.
Nearly three years since Britain voted 52 per cent to 48 per cent to leave the European Union, May is trying one last time to get her divorce deal approved by the British parliament before her crisis-riven premiership ends.
May on Tuesday appealed to lawmakers to get behind her deal, offering the prospect of a possible second referendum on the agreement and closer trading arrangements with the EU as incentives.
Conservative and Labour lawmakers lined up to criticise May's Withdrawal Agreement Bill, or WAB, legislation which implements the terms of Britain's departure.
"We are being asked to vote for a customs union and a second referendum," Boris Johnson, the bookies favourite to be Britain's next prime minister, said.
"The Bill is directly against our manifesto - and I will not vote for it. We can and must do better - and deliver what the people voted for," he said.
The deadlock in London means it is unclear how, when or even if Britain will leave the EU. The current deadline to leave is October 31.
The world's fifth largest economy faces an array of options including an exit with a deal to smooth the transition, a no-deal exit, an election or a second referendum.
US investment bank JPMorgan raised its probability of a no-deal Brexit to 25 per cent from 15 per cent, saying its base case was that Johnson would become prime minister followed by a general election.
Labour leader Jeremy Corbyn said his party could not vote for the Withdrawal Bill, describing May's new offer as "largely a rehash of the government's position" in talks with the opposition that broke down last week.
"It's far too weak. It doesn't really offer anything new or anything bold," Labor's Brexit spokesman Kier Starer said.
"It's already pretty clear that it's heading for a pretty big loss and I think frankly the prime minister would do well to just admit defeat and I think she should announce today that she's not going to put the vote because it's clearly heading in the wrong direction."
May wrote to Corbyn, asking him to compromise so that Brexit could take place.
"I have shown today that I am willing to compromise to deliver Brexit for the British people," May wrote. "The WA is our last chance to do so," May said.
"I ask you to compromise too so that we can deliver what both our parties promised in our manifestos and restore faith in our politics," she said.
Northern Ireland's Democratic Unionist Party, which props up May's minority government, said the "fatal flaws" of her original deal remained. They fear the divorce deal could see Northern Ireland split from the rest of the UK.
Such is the discord that some Conservative Party lawmakers have begun a new push to oust her even earlier so that she doesn't have the chance to put her Brexit plan to a vote in parliament, the BBC's political editor Laura Kuenssberg said.
Australian Associated Press