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British MPs gathered on Saturday for a knife-edge vote on Prime Minister Boris Johnson’s Brexit deal for a decision that could see the UK leave the EU this month or plunge the country into fresh uncertainty.

The parliament was holding its first Saturday sitting since the 1982 Falklands War to debate the terms of a divorce agreement Johnson struck with European Union leaders Thursday.

Opposition parties and Johnson’s own Northern Irish allies have rejected the text but the prime minister and his team have spent the past 48 hours frantically trying to win the support of wavering MPs.

The vote …