When she needed a break from the Brexit wars, Theresa May would head for the hills.
Far from the pressure-cooker of Westminster, May spent every summer between 2016 and 2019 — her three years as U.K. prime minister — walking in the mountains of Switzerland.
Her favorite spot was the resort town of Zermatt, in the shadow of the Matterhorn. There, she later told aides, she witnessed something far more troubling than her latest duel with Brussels or yet another hostile briefing from a backbench Brexiteer.