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LONDON, UNITED KINGDOM - MARCH 28: : (----EDITORIAL USE ONLY MANDATORY CREDIT - PRIME MINISTRY OF THE UNITED KINGDOM / HANDOUT " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) British Prime Minister Theresa May signs the official letter to European Council President Donald Tusk invoking Article 50 and the United Kingdom's intention to leave the EU on March 28, 2017 in London, England. After holding a referendum in June 2016 the United Kingdom voted to leave the European Union. (Photo by PRIME MINISTRY OF THE UNITED KINGDOM / HANDOUT /Anadolu Agency/Getty Images)

LONDON, UNITED KINGDOM - MARCH 28: : (----EDITORIAL USE ONLY MANDATORY CREDIT - PRIME MINISTRY OF THE UNITED KINGDOM / HANDOUT " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) British Prime Minister Theresa May signs the official letter to European Council President Donald Tusk invoking Article 50 and the United Kingdom's intention to leave the EU on March 28, 2017 in London, England. After holding a referendum in June 2016 the United Kingdom voted to leave the European Union. (Photo by PRIME MINISTRY OF THE UNITED KINGDOM / HANDOUT /Anadolu Agency/Getty Images)
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Britain's Ambassador to the EU Tim Barrow (R) walks away after handing European Council President Donald Tusk the British prime minister's formal notice of the UK's intention to leave the EU under Article 50 of the Lisbon Treaty in Brussels on March 29, 2017. Britain launched the process to leave the European Union on March 29, saying there was "no turning back" from the historic move that has split the country and thrown the bloc's future into question. / AFP PHOTO / POOL / YVES HERMAN (Photo credit should read YVES HERMAN/AFP via Getty Images)

Britain's Ambassador to the EU Tim Barrow (R) walks away after handing European Council President Donald Tusk the British prime minister's formal notice of the UK's intention to leave the EU under Article 50 of the Lisbon Treaty in Brussels on March 29, 2017. Britain launched the process to leave the European Union on March 29, saying there was "no turning back" from the historic move that has split the country and thrown the bloc's future into question. / AFP PHOTO / POOL / YVES HERMAN (Photo credit should read YVES HERMAN/AFP via Getty Images)
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A pedestrian shelters from the rain beneath a Union flag themed umbrella as they walk near the Big Ben clock face and the Elizabeth Tower at the Houses of Parliament in central London on June 25, 2016, following the pro-Brexit result of the UK's EU referendum vote. The result of Britain's June 23 referendum vote to leave the European Union (EU) has pitted parents against children, cities against rural areas, north against south and university graduates against those with fewer qualifications. London, Scotland and Northern Ireland voted to remain in the EU but Wales and large swathes of England, particularly former industrial hubs in the north with many disaffected workers, backed a Brexit. / AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

A pedestrian shelters from the rain beneath a Union flag themed umbrella as they walk near the Big Ben clock face and the Elizabeth Tower at the Houses of Parliament in central London on June 25, 2016, following the pro-Brexit result of the UK's EU referendum vote. The result of Britain's June 23 referendum vote to leave the European Union (EU) has pitted parents against children, cities against rural areas, north against south and university graduates against those with fewer qualifications. London, Scotland and Northern Ireland voted to remain in the EU but Wales and large swathes of England, particularly former industrial hubs in the north with many disaffected workers, backed a Brexit. / AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
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AFP JUSTIN TALLIS

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European Council President Donald Tusk holds British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty that was delivered to him by Britain's ambassador to the EU, during a press conference in Brussels on March 29, 2017. Britain formally launches the process for leaving the European Union on Wednesday, a historic step that has divided the country and thrown into question the future of the European unity project. / AFP PHOTO / Emmanuel DUNAND (Photo credit should read EMMANUEL DUNAND/AFP via Getty Images)

European Council President Donald Tusk holds British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty that was delivered to him by Britain's ambassador to the EU, during a press conference in Brussels on March 29, 2017. Britain formally launches the process for leaving the European Union on Wednesday, a historic step that has divided the country and thrown into question the future of the European unity project. / AFP PHOTO / Emmanuel DUNAND (Photo credit should read EMMANUEL DUNAND/AFP via Getty Images)
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AFP EMMANUEL DUNAND

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A television screen displays an image of British Prime Minister Theresa May as she speaks during Prime Minister's Questions in the Houses of Parliament following the triggering of Article 50 of the Lisbon Treaty to begin the process of Britain's withdrawl from the European Union (EU), as man drinks a pint of beer inside the The Black Bull pub in Edinburgh, on March 29, 2017. Britain and the European Union must "work hard" to avoid a failure in Brexit negotiations, Prime Minister Theresa May said in the letter formally launching the process, calling it a "momentous" challenge. May also called for talks on Britain's exit and on future trade ties to be worked out "alongside" each other, although the EU has said the new trading relationship should only be discussed after Brexit is agreed. / AFP PHOTO / Andy Buchanan (Photo credit should read ANDY BUCHANAN/AFP via Getty Images)

A television screen displays an image of British Prime Minister Theresa May as she speaks during Prime Minister's Questions in the Houses of Parliament following the triggering of Article 50 of the Lisbon Treaty to begin the process of Britain's withdrawl from the European Union (EU), as man drinks a pint of beer inside the The Black Bull pub in Edinburgh, on March 29, 2017. Britain and the European Union must "work hard" to avoid a failure in Brexit negotiations, Prime Minister Theresa May said in the letter formally launching the process, calling it a "momentous" challenge. May also called for talks on Britain's exit and on future trade ties to be worked out "alongside" each other, although the EU has said the new trading relationship should only be discussed after Brexit is agreed. / AFP PHOTO / Andy Buchanan (Photo credit should read ANDY BUCHANAN/AFP via Getty Images)
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AFP ANDY BUCHANAN