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Jean-Claude Juncker, president of the European Commission, center, departs a Europe in crisis mode panel discussion in Berlin, Germany, on Thursday, May 12, 2016. Juncker said the U.K. mustn't expect business-as-usual treatment from the EU should Britons vote to leave the bloc in their June 23 referendum. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

Jean-Claude Juncker, president of the European Commission, center, departs a Europe in crisis mode panel discussion in Berlin, Germany, on Thursday, May 12, 2016. Juncker said the U.K. mustn't expect business-as-usual treatment from the EU should Britons vote to leave the bloc in their June 23 referendum. Photographer: Krisztian Bocsi/Bloomberg via Getty Images