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YORK, ENGLAND - MARCH 17: Nick Clegg MP addresses delegates during a rally on the first day of the Liberal Democrats spring conference at York Barbican on March 17, 2017 in York, England. Lib Dem leader Tim Farron is to rally members during the weekend and appeal to voters across the United Kingdom who voted to remain in the EU at the referendum. (Photo by Christopher Furlong/Getty Images)

YORK, ENGLAND - MARCH 17:  Nick Clegg MP addresses delegates during a rally on the first day of the Liberal Democrats spring conference at York Barbican on March 17, 2017 in York, England. Lib Dem leader Tim Farron is to rally members during the weekend and appeal to voters across the United Kingdom who voted to remain in the EU at the referendum.  (Photo by Christopher Furlong/Getty Images)

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KINGSTON UPON THAMES, ENGLAND - JUNE 01: Former Lib-Dem leader, Nick Clegg visits Kingston Hospital on June 1, 2017 in Kingston upon Thames, England. Britain goes to the polls to vote in a general election on June 8. (Photo by Leon Neal/Getty Images)

KINGSTON UPON THAMES, ENGLAND - JUNE 01:  Former Lib-Dem leader, Nick Clegg visits Kingston Hospital on June 1, 2017 in Kingston upon Thames, England. Britain goes to the polls to vote in a general election on June 8.  (Photo by Leon Neal/Getty Images)

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LONDON, ENGLAND - MAY 08: Nick Clegg, Leader of the Liberal Democrats delivers a statement of his resignation at the ICA on May 8, 2015 in London, England. After the United Kingdom went to the polls yesterday the Conservative party are confirmed as the winners of a closely fought general election which has returned David Cameron as Prime Minister with a slender majority for his party. (Photo by Ian Gavan/Getty Images)

LONDON, ENGLAND - MAY 08:  Nick Clegg, Leader of the Liberal Democrats delivers a statement of his resignation at the ICA on May 8, 2015 in London, England.  After the United Kingdom went to the polls yesterday the Conservative party are confirmed as the winners of a closely fought general election which has returned David Cameron as Prime Minister with a slender majority for his party.  (Photo by Ian Gavan/Getty Images)

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LONDON, ENGLAND - SEPTEMBER 16: Nick Clegg attends as the London Evening Standard Progress 1000 list is revealed at Canary Wharf Crossrail on September 16, 2015 in London, England. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - SEPTEMBER 16:  Nick Clegg attends as the London Evening Standard Progress 1000 list is revealed at Canary Wharf Crossrail on September 16, 2015 in London, England.  (Photo by Chris Jackson/Getty Images)

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LONDON, ENGLAND - MAY 02: Former Liberal Democrat leader Nick Clegg gives a speech at the National Liberal Club on May 2, 2017 in London, England. During his speech Mr Clegg warned UK consumers that they will inevitably feel a Brexit squeeze on their household finances. (Photo by Leon Neal/Getty Images)

LONDON, ENGLAND - MAY 02:  Former Liberal Democrat leader Nick Clegg gives a speech at the National Liberal Club on May 2, 2017 in London, England. During his speech Mr Clegg warned UK consumers that they will inevitably feel a Brexit squeeze on their household finances.  (Photo by Leon Neal/Getty Images)