ROME, ITALY - MARCH 27:  U.S. President Barack Obama (L) meets Italian Premier Matteo Renzi (R) at Villa Madama on March 27, 2014 in Rome, Italy. The visit to Italy by President Obama is part of a series of institutional meetings in Europe, which began in The Hague on March 24, with a summit on nuclear security.  (Photo by Alberto Lingria-Pool/Getty Images)