Boris Johnson, U.K. foreign secretary, speaks during an event hosted by the Lowy Institute for International Policy in Sydney, Australia. (Photographer: Brendon Thorne/Bloomberg)

Future of British Union Becomes Battleground for No-Deal Brexit

(Bloomberg) -- Boris Johnson, the front-runner to replace Theresa May as British prime minister, said delivering Brexit would be key to keeping the U.K. together, just hours after May warned her su...