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British Prime Minister David Cameron (L) poses for a photograph after addressing pro-EU 'Vote Remain' supporters at rally in Bristol, south-west England, on June 22, 2016, whilst campaigning to avoid a Brexit, ahead of the June 23 EU referendum. Rival sides threw their efforts into the final day of campaigning Wednesday, on the eve of Britain's vote on EU membership that will shape the future of Europe. / AFP / POOL / Geoff CADDICK (Photo credit should read GEOFF CADDICK/AFP/Getty Images)

British Prime Minister David Cameron (L) poses for a photograph after addressing pro-EU 'Vote Remain' supporters at rally in Bristol, south-west England, on June 22, 2016, whilst campaigning to avoid a Brexit, ahead of the June 23 EU referendum.
Rival sides threw their efforts into the final day of campaigning Wednesday, on the eve of Britain's vote on EU membership that will shape the future of Europe.
 / AFP / POOL / Geoff CADDICK        (Photo credit should read GEOFF CADDICK/AFP/Getty Images)