UK Prime Minister Theresa May is reaching out to some opposition Labour MPs to try and win support for the vote on her Brexit deal on Tuesday.
She's considering backing extra protections for workers and environmental standards.
But Labour leader Jeremy Corbyn says a UK general election is the only way to break the Brexit deadlock, with Britain due to leave the EU in March.
Mrs May is widely expected to lose Tuesday's vote and will then be required to set out her Plan B within days.
Labour MP Alison McGovern says new options are needed urgently.
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Former Northern Ireland police chief Hugh Orde says a No Deal Brexit would lead to border controls which would be a disaster for the peace process.
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