Britain should vote again on whether to remain in the European Union once a Brexit deal is agreed, Owen Smith, one of three candidates vying to lead Britain's opposition Labour Party, the Guardian newspaper reported.

Smith, who announced his candidacy to succeed Jeremy Corbyn at helm of the centre-left party, said many Britons who backed leaving the EU believe they were misled and should be given a second chance to vote.

"That does mean a second referendum or a general election when the terms are clear. The Labour government should be committing to that," he told the Guardian newspaper.

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