Boris Johnson's described as "utterly ludicrous" claims the Brexit campaign - he backed - broke British election spending rules.
Labour in Britain's suggested the police could be called in to investigate after a whistle-blower said Vote Leave "cheated".
The campaign strongly denies the accusations, and the British Foreign Secretary's tweeted to say it "won fair and square - and legally."
Labour MP, Ben Bradshaw, voted to remain in the EU:
