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MANSFIELD, UNITED KINGDOM: Prime Minister Theresa May (C) speaks to an assembled crowd during a general election campaign event at marketing services group Linney on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8th. (Photo by Oli Scarff - WPA Pool/Getty Images)

MANSFIELD, UNITED KINGDOM: Prime Minister Theresa May (C) speaks to an assembled crowd during a general election campaign event at marketing services group Linney on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8th. (Photo by Oli Scarff  - WPA Pool/Getty Images)

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MANSFIELD, UNITED KINGDOM: Prime Minister Theresa May (C) speaks to an assembled crowd during a general election campaign event at marketing services group Linney on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8th. (Photo by Oli Scarff - WPA Pool/Getty Images)

MANSFIELD, UNITED KINGDOM: Prime Minister Theresa May (C) speaks to an assembled crowd during a general election campaign event at marketing services group Linney on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8th. (Photo by Oli Scarff  - WPA Pool/Getty Images)

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MANSFIELD, UNITED KINGDOM: Prime Minister Theresa May (C) speaks to an assembled crowd during a general election campaign event at marketing services group Linney on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8th. (Photo by Oli Scarff - WPA Pool/Getty Images)

MANSFIELD, UNITED KINGDOM: Prime Minister Theresa May (C) speaks to an assembled crowd during a general election campaign event at marketing services group Linney on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8th. (Photo by Oli Scarff  - WPA Pool/Getty Images)

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SCUNTHORPE, ENGLAND - MAY 10: British Prime Minister Theresa May talks to staff in a tea room at British Steel as she campaigns in North Lincolnshire on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8. (Photo by Dan Kitwood - WPA Pool/Getty Images)

SCUNTHORPE, ENGLAND - MAY 10:  British Prime Minister Theresa May talks to staff in a tea room at British Steel as she campaigns in North Lincolnshire on May 10, 2017 in Scunthorpe, England. Campaigning is underway ahead of the general election which is to be held on June 8.  (Photo by Dan Kitwood - WPA Pool/Getty Images)