BELFAST—British Prime Minister Theresa May on Friday was set to call on the European Union to strike a new deal to prevent a hard border in Northern Ireland and demand Brussels quickly respond to her ‘white paper’ plan to avoid a damaging no-deal Brexit.

Britain's Prime Minister Theresa May and Arlene Foster, the leader of the Democratic Unionist Party (DUP) visit Belleek Pottery, in St Belleek, Fermanagh, Northern Ireland, July 19, 2018. Reuters/Clodagh Kilcoyne/Pool
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