EU Leaders Gather To Mark 60 Year Anniversary Of The Treaty Of Rome Signing [Getty Images]

ROME, ITALY - MARCH 25 : German Chancellor Angela Merkel (2R) poses with Malta's Prime Minister and EU's rounding President Joseph Muscat (L), EU Council's President Donald Tusk (2L) and Italian Premier Paolo Gentiloni (R) as he arrives for a ceremony marking the EU's 60th anniversary of the Treaty of Rome, at the Campidoglio in Rome, Italy, on March 25, 2017. (Photo by Riccardo De Luca/Anadolu Agency/Getty Images)

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