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Theresa May, U.K. prime minister and leader of the Conservative Party, gestures while speaking at a general-election campaign event in Slough, U.K., on Tuesday, June 6, 2017. After the London and Manchester attacks, Theresa May says that only she can be trusted on the issue and accuses opposition leader Jeremy Corbyn of sympathizing with terrorists in the past. Corbyn retorts that May was in charge of internal security for six years before becoming prime minister and failed to make Britons any safer. Photographer: Gerry Penny/Pool via Bloomberg

Theresa May, U.K. prime minister and leader of the Conservative Party, gestures while speaking at a general-election campaign event in Slough, U.K., on Tuesday, June 6, 2017. After the London and Manchester attacks, Theresa May says that only she can be trusted on the issue and accuses opposition leader Jeremy Corbyn of sympathizing with terrorists in the past. Corbyn retorts that May was in charge of internal security for six years before becoming prime minister and failed to make Britons any safer. Photographer: Gerry Penny/Pool via Bloomberg

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Theresa May, U.K. prime minister and leader of the Conservative Party, gestures while speaking at a general-election campaign event in Slough, U.K., on Tuesday, June 6, 2017. After the London and Manchester attacks, Theresa May says that only she can be trusted on the issue and accuses opposition leader Jeremy Corbyn of sympathizing with terrorists in the past. Corbyn retorts that May was in charge of internal security for six years before becoming prime minister and failed to make Britons any safer. Photographer: Gerry Penny/Pool via Bloomberg

Theresa May, U.K. prime minister and leader of the Conservative Party, gestures while speaking at a general-election campaign event in Slough, U.K., on Tuesday, June 6, 2017. After the London and Manchester attacks, Theresa May says that only she can be trusted on the issue and accuses opposition leader Jeremy Corbyn of sympathizing with terrorists in the past. Corbyn retorts that May was in charge of internal security for six years before becoming prime minister and failed to make Britons any safer. Photographer: Gerry Penny/Pool via Bloomberg

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Theresa May, U.K. prime minister and leader of the Conservative Party, gestures while speaking during the launch of the Welsh Conservative general election manifesto in Wrexham, U.K., on Monday, May 22, 2017. The pound fell below $1.30 after the U.K. hardened its Brexit rhetoric and polls predicted a narrower-than-expected win for May in June elections. Photographer: Chris J. Ratcliffe/Bloomberg via Getty Images

Theresa May, U.K. prime minister and leader of the Conservative Party, gestures while speaking during the launch of the Welsh Conservative general election manifesto in Wrexham, U.K., on Monday, May 22, 2017. The pound fell below $1.30 after the U.K. hardened its Brexit rhetoric and polls predicted a narrower-than-expected win for May in June elections. Photographer: Chris J. Ratcliffe/Bloomberg via Getty Images

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Theresa May, U.K. prime minister and leader of the Conservative Party, gestures as she speaks during a campaign event in Twickenham, London, U.K., on Monday, May 29, 2017. Mays Conservatives maintained their focus on terrorism after the attack on a pop concert on May 22, Labour said the prime ministers U-turn on care for the elderly on the same day left many questions unanswered. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Theresa May, U.K. prime minister and leader of the Conservative Party, gestures as she speaks during a campaign event in Twickenham, London, U.K., on Monday, May 29, 2017. Mays Conservatives maintained their focus on terrorism after the attack on a pop concert on May 22, Labour said the prime ministers U-turn on care for the elderly on the same day left many questions unanswered. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

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Theresa May, U.K. prime minister and leader of the Conservative Party, speaks at a general-election campaign event in Slough, U.K., on Tuesday, June 6, 2017. After the London and Manchester attacks, Theresa May says that only she can be trusted on the issue and accuses opposition leader Jeremy Corbyn of sympathizing with terrorists in the past. Corbyn retorts that May was in charge of internal security for six years before becoming prime minister and failed to make Britons any safer. Photographer: Gerry Penny/Pool via Bloomberg

Theresa May, U.K. prime minister and leader of the Conservative Party, speaks at a general-election campaign event in Slough, U.K., on Tuesday, June 6, 2017. After the London and Manchester attacks, Theresa May says that only she can be trusted on the issue and accuses opposition leader Jeremy Corbyn of sympathizing with terrorists in the past. Corbyn retorts that May was in charge of internal security for six years before becoming prime minister and failed to make Britons any safer. Photographer: Gerry Penny/Pool via Bloomberg