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LONDON, UNITED KINGDOM - JANUARY 25: Larry, the Downing Street cat, wears a Union Flag collar as British Prime Minister Theresa May heads to the weekly Prime Minister's Questions (PMQ) session in the House of Commons after leaving number 10 Downing Street in London, England, United Kingdom on January 25, 2017. The British government is facing increasing pressure to publish it's Brexit plans in a formal White Paper. (Photo by Kate Green/Anadolu Agency/Getty Images)

LONDON, UNITED KINGDOM - JANUARY 25: Larry, the Downing Street cat, wears a Union Flag collar as British Prime Minister Theresa May heads to the weekly Prime Minister's Questions (PMQ) session in the House of Commons after leaving number 10 Downing Street in London, England, United Kingdom on January 25, 2017. The British government is facing increasing pressure to publish it's Brexit plans in a formal White Paper. (Photo by Kate Green/Anadolu Agency/Getty Images)