Boris Johnson, former U.K. foreign secretary, gestures as he delivers a speech during the Conservative Party annual conference in Birmingham, U.K. (Photographer: Chris Ratcliffe/Bloomberg)

Johnson Hardens Brexit Rhetoric as Opponents Launch Campaigns

(Bloomberg) -- Boris Johnson, the front-runner to succeed Theresa May as U.K. prime minister, hardened his rhetoric on Brexit and unveiled a tax-cut plan as the other leading candidates prepared to...