Boris Johnson, the front-runner to become prime minister of the U.K., has long been known for his controversial comments and blunders. Now, that is prompting critics to question his ability to lead the country through an already divisive Brexit process. Photo: HandoutLONDON—When Boris Johnson last visited the White House in 2018, Britain’s then foreign secretary surprised aides by wandering around, entering doors at random to greet staffers and bumping into President Trump’s son-in-law Jared Kushner. This unorthodox approach has kindled an unexpectedly warm relationship with the Trump administration. While some leaders have winced at Britain’s chaotic attempts to break from the European Union, Mr. Trump...

Source: Wall Street Journal June 21, 2019 11:15 UTC