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LISBURN, NORTHERN IRELAND - MAY 13: British Prime Minister Theresa May speaks with visitors at the Balmoral Show during a general election campaign visit on May 13, 2017, in Lisburn, Northern Ireland. . Britain will vote in a general election on June 8. (Photo by Justin Tallis-WPA Pool/Getty Images)

LISBURN, NORTHERN IRELAND - MAY 13: British Prime Minister Theresa May speaks with visitors at the Balmoral Show during a general election campaign visit on May 13, 2017, in Lisburn, Northern Ireland. . Britain will vote in a general election on June 8.  (Photo by Justin Tallis-WPA Pool/Getty Images)

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LISBURN, NORTHERN IRELAND - MAY 13: British Prime Minister Theresa May speaks with visitors at the Balmoral Show during a general election campaign visit on May 13, 2017, in Lisburn, Northern Ireland. . Britain will vote in a general election on June 8. (Photo by Justin Tallis-WPA Pool/Getty Images)

LISBURN, NORTHERN IRELAND - MAY 13: British Prime Minister Theresa May speaks with visitors at the Balmoral Show during a general election campaign visit on May 13, 2017, in Lisburn, Northern Ireland. . Britain will vote in a general election on June 8.  (Photo by Justin Tallis-WPA Pool/Getty Images)

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British Prime Minister Theresa May (L) speaks with visitors as she walks around at the Balmoral Show near Lisburn, Northern Ireland, on May 13, 2107 during a general election campaign visit. Britain goes to the polls on June 8 to elect a new parliament in a general election. / AFP PHOTO / POOL / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

British Prime Minister Theresa May (L) speaks with visitors as she walks around at the Balmoral Show near Lisburn, Northern Ireland, on May 13, 2107 during a general election campaign visit. 
Britain goes to the polls on June 8 to elect a new parliament in a general election. / AFP PHOTO / POOL / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)