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Guests wearing pro Brexit t-shirts arrive for the premiere of "Brexit: The Movie" in London, U.K., on Wednesday, May 11, 2016. While online polls suggest the contest for the June 23 referendum is too close to call, less frequent telephone polling has put the "Remain" camp ahead. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Guests wearing pro Brexit t-shirts arrive for the premiere of "Brexit: The Movie" in London, U.K., on Wednesday, May 11, 2016. While online polls suggest the contest for the June 23 referendum is too close to call, less frequent telephone polling has put the "Remain" camp ahead. Photographer: Chris Ratcliffe/Bloomberg via Getty Images