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ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May campaigns with Conservative Councillor Samuel Currie (C) on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017. (Photo by Peter Byrne - WPA Pool/Getty Images)

ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May campaigns with Conservative Councillor Samuel Currie (C) on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017.  (Photo by Peter Byrne - WPA Pool/Getty Images)

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ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May campaigns with Conservative Councillor Samuel Currie (L) on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017. (Photo by Peter Byrne - WPA Pool/Getty Images)

ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May campaigns with Conservative Councillor Samuel Currie (L) on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017.  (Photo by Peter Byrne - WPA Pool/Getty Images)

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ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May speaks at Mawdesley Hall on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017. (Photo by Peter Byrne - WPA Pool/Getty Images)

ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May speaks at Mawdesley Hall on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017.  (Photo by Peter Byrne - WPA Pool/Getty Images)

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ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May speaks at Mawdesley Hall on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017. (Photo by Peter Byrne - WPA Pool/Getty Images)

ORMSKIRK, ENGLAND - MAY 01: British Prime Minister Theresa May speaks at Mawdesley Hall on May 1, 2017 in Ormskirk, West Lancashire, England. After campaigning on the doorsteps of Lancashire the prime minister gave a speech to supporters as she attempts to gain a larger Brexit mandate by holding a snap general election on June 8th 2017.  (Photo by Peter Byrne - WPA Pool/Getty Images)