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Theresa May, U.K. prime minister, leaves number 10 Downing Street to greet Arlene Foster, leader of the Democratic Unionist Party (DUP), in London, U.K., on Monday, June 26, 2017. May is resuming discussions with the Democratic Unionists as she aims to nail down an agreement with the Northern Irish party to ensure her Conservatives keep a grip on power. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Theresa May, U.K. prime minister, leaves number 10 Downing Street to greet Arlene Foster, leader of the Democratic Unionist Party (DUP), in London, U.K., on Monday, June 26, 2017. May is resuming discussions with the Democratic Unionists as she aims to nail down an agreement with the Northern Irish party to ensure her Conservatives keep a grip on power. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

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Theresa May, U.K. prime minister, leaves number 10 Downing Street to greet Arlene Foster, leader of the Democratic Unionist Party (DUP), in London, U.K., on Monday, June 26, 2017. May is resuming discussions with the Democratic Unionists as she aims to nail down an agreement with the Northern Irish party to ensure her Conservatives keep a grip on power. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Theresa May, U.K. prime minister, leaves number 10 Downing Street to greet Arlene Foster, leader of the Democratic Unionist Party (DUP), in London, U.K., on Monday, June 26, 2017. May is resuming discussions with the Democratic Unionists as she aims to nail down an agreement with the Northern Irish party to ensure her Conservatives keep a grip on power. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

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Left to right, Nigel Dodds, deputy leader of the Democratic Unionist Party (DUP), Theresa May, U.K. prime minister, Arlene Foster, leader of the Democratic Unionist Party (DUP), and Jeffrey Donaldson, lawmaker from the Democratic Unionist Party (DUP), pose for photographers outside number 10 Downing Street in London, U.K., on Monday, June 26, 2017. May is resuming discussions with the Democratic Unionists as she aims to nail down an agreement with the Northern Irish party to ensure her Conservatives keep a grip on power. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Left to right, Nigel Dodds, deputy leader of the Democratic Unionist Party (DUP), Theresa May, U.K. prime minister, Arlene Foster, leader of the Democratic Unionist Party (DUP), and Jeffrey Donaldson, lawmaker from the Democratic Unionist Party (DUP), pose for photographers outside number 10 Downing Street in London, U.K., on Monday, June 26, 2017. May is resuming discussions with the Democratic Unionists as she aims to nail down an agreement with the Northern Irish party to ensure her Conservatives keep a grip on power. Photographer: Chris Ratcliffe/Bloomberg via Getty Images