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DESENZANO DEL GARDA, ITALY - JULY 25: British Prime Minister Theresa May, left, walks with her husband Philip close to Lake Garda on July 25, 2017 in Desenzano del Garda, Italy. May is spending her holidays in northern Italy. (Photo by Antonio Calanni - WPA Pool/Getty Images)

DESENZANO DEL GARDA, ITALY - JULY 25:  British Prime Minister Theresa May, left, walks with her husband Philip close to Lake Garda on July 25, 2017 in Desenzano del Garda, Italy. May is spending her holidays in northern Italy. (Photo by Antonio Calanni - WPA Pool/Getty Images)

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DESENZANO DEL GARDA, ITALY - JULY 25: British Prime Minister Theresa May, left, walks with her husband Philip on July 25, 2017 in Desenzano del Garda, Italy. May is spending her holidays in northern Italy. (Photo by Antonio Calanni - WPA Pool/Getty Images)

DESENZANO DEL GARDA, ITALY - JULY 25:  British Prime Minister Theresa May, left, walks with her husband Philip on July 25, 2017 in Desenzano del Garda, Italy. May is spending her holidays in northern Italy. (Photo by Antonio Calanni - WPA Pool/Getty Images)

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DESENZANO DEL GARDA, ITALY - JULY 25: British Prime Minister Theresa May, left, walks with her husband Philip on July 25, 2017 in Desenzano del Garda, Italy. May is spending her holidays in northern Italy. (Photo by Antonio Calanni - WPA Pool/Getty Images)

DESENZANO DEL GARDA, ITALY - JULY 25:  British Prime Minister Theresa May, left, walks with her husband Philip on July 25, 2017 in Desenzano del Garda, Italy. May is spending her holidays in northern Italy. (Photo by Antonio Calanni - WPA Pool/Getty Images)