PM Theresa May has suffered another political blow as MPs voted to force May to quickly set out an alternative plan for Brexit if she loses a crucial vote on her EU withdrawal.
British Prime Minister Theresa May suffered an early defeat to her Brexit plans on Wednesday, when parliament demanded the government come up with a plan B within days if she loses a vote on her deal to leave the European Union.
With less than three months before Britain is due to leave the EU, parliament began a five-day battle over May's Brexit plan with a show of force undermining her preferred timetable if lawmakers vote down her deal next Tuesday.
May has refused to retreat from her unpopular deal, which envisages close trading ties with the EU after leaving in March, pressing ahead with the vote that she looks set to lose after failing to win over her nominal Northern Irish allies.
Losing the vote would deepen the uncertainty over the future of Brexit, Britain's biggest shift in foreign and trade policy for more than 40 years, and open the way for several different outcomes, ranging from a disorderly exit to another referendum.
Lawmakers voted 308-297 in favour of demanding the government come up with an alternative plan within three working days after Tuesday's vote, rather than a planned 21-day limit, in a non-binding motion that nonetheless piles pressure on the government.
There were turbulent scenes in parliament when some in May's Conservative Party accused the speaker of bias.
Responding to the vote, Brexit Minister Stephen Barclay told parliament it was the government's intention to act quickly if it lost Tuesday's vote.
"I also want to reassure colleagues that whatever the outcome of this debate, we will respond rapidly, recognising that we must provide parliament with as much security as possible," Barclay said.
But combined with a vote late on Tuesday when the government lost on the finance bill, the defeats underline May's precarious position in parliament.
The opposition Labour Party says it will call for a vote of no confidence in the government if May loses the vote. One of Labour's top policy team said that would take place immediately, but a spokesman said the timing would be decided as events unfold.
TRT World's Simon McGregor-Wood has more.
With the likelihood of a no-deal Brexit rising, the EU is looking at how Brexit might be postponed, and pro-EU campaigners are testing ways Britain could hold another referendum after voters narrowly backed leaving in 2016.
Earlier on Wednesday, May called on parliament to back her deal, suggesting she was confident of getting further assurances from the EU to ease their concerns and offering Northern Ireland more control over the "backstop" arrangement to prevent the return of a hard border with EU member Ireland.
"I've been in contact with European leaders ... about MPs' (members of parliament) concerns. These discussions have shown that further clarification over the backstop is possible and those talks will continue over the next few days," May said.
The government also offered a concession to the Democratic Unionist Party, saying Northern Ireland would have "a strong role" in any decision between triggering the backstop or extending a transition period if a future relationship with the EU is not in place by December 2020.
That suggestion did little to win over the DUP. Sammy Wilson, the party's Brexit spokesman, said, "The only thing which could swing the DUP round is if the backstop as it applies to the United Kingdom as a whole or to Northern Ireland specifically were removed from this agreement."
Wilson, one of 10 DUP lawmakers propping up May's minority government, described her deal as "ruinous."
Britain is due to leave the EU on March 29 at 2300 GMT.
May told lawmakers that parliament had a choice: back her or risk Britain leaving the bloc without a deal, a scenario many businesses say would disrupt supply chains and hinder investment in the world's fifth-largest economy.
May's de-facto deputy said it was a delusion to think the government would be able to negotiate a new divorce deal if parliament voted down hers.
"I don't think the British public are served by fantasies about magical, alternative deals that are somehow going to spring out of a cupboard in Brussels," Cabinet Office Minister David Lidington told BBC radio.
The government needs 318 votes to get a deal through the 650-seat House of Commons, as seven members of Irish nationalist party Sinn Fein do not sit, four speakers and deputy speakers do not vote and the four tellers are not counted.
Some investors and major banks believe May's deal will be defeated on Tuesday but that eventually it will be approved.