Britain and the United States have often seemed lashed together amid the populist storms of the last few years — Brexit and the Trump White House echoing and amplifying each other across the Atlantic. But in one respect they have radically diverged.

In London, rebels in the Conservative Party staged a dramatic insurrection in the past week against Prime Minister Boris Johnson, blocking his plan to withdraw Britain from the European Union even without a deal. In Washington, scarcely a handful of Republicans have stood up to President Donald Trump, even when he has flouted party orthodoxy on issues like

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