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BURNHAM-ON-SEA, ENGLAND - MAY 09: Leader of the Liberal Democrats Tim Farron steps off a search and rescue boat as he campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election. (Photo by Matt Cardy/Getty Images)

BURNHAM-ON-SEA, ENGLAND - MAY 09:  Leader of the Liberal Democrats Tim Farron steps off a search and rescue boat as he campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election.  (Photo by Matt Cardy/Getty Images)

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BURNHAM-ON-SEA, ENGLAND - MAY 09: Leader of the Liberal Democrats Tim Farron and Tessa Munt MP on a search and rescue boat as he campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election. (Photo by Matt Cardy/Getty Images)

BURNHAM-ON-SEA, ENGLAND - MAY 09:  Leader of the Liberal Democrats Tim Farron and Tessa Munt MP on a search and rescue boat as he campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election.  (Photo by Matt Cardy/Getty Images)

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BURNHAM-ON-SEA, ENGLAND - MAY 09: Leader of the Liberal Democrats Tim Farron campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election. (Photo by Matt Cardy/Getty Images)

BURNHAM-ON-SEA, ENGLAND - MAY 09:  Leader of the Liberal Democrats Tim Farron campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election.  (Photo by Matt Cardy/Getty Images)

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BURNHAM-ON-SEA, ENGLAND - MAY 09: Leader of the Liberal Democrats Tim Farron and Tessa Munt MP are seen on a search and rescue boat as he campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election. (Photo by Matt Cardy/Getty Images)

BURNHAM-ON-SEA, ENGLAND - MAY 09:  Leader of the Liberal Democrats Tim Farron and Tessa Munt MP are seen on a search and rescue boat as he campaigns at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election.  (Photo by Matt Cardy/Getty Images)

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BURNHAM-ON-SEA, ENGLAND - MAY 09: Leader of the Liberal Democrats Tim Farron campaigns with Tessa Munt MP at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election. (Photo by Matt Cardy/Getty Images)

BURNHAM-ON-SEA, ENGLAND - MAY 09:  Leader of the Liberal Democrats Tim Farron campaigns with Tessa Munt MP at a volunteer-run Rescue Boat Service on May 9, 2017 at Burnham-on-Sea, England. Campaigning is underway ahead of the June 8th general election.  (Photo by Matt Cardy/Getty Images)