By the end of the summer, Keir Starmer had led the Labour Party to a dominant election win to become Britain’s new prime minister, and Donald Trump was looking like an even bet to reclaim the White House.

As I suggested in February, Trump and Starmer could hardly be more different in politics, personality or attitude — the Barnum-like cult leader, focused on power, cut a sharp contrast with the stiffly pious public prosecutor.

There have been several awkward stumbles in the relationship between the once-and-future president and his British counterpart. Starmer’s foreign secretary, David Lammy, has been furiously backtracking on a record of social media denunciations of Trump: a “tyrant in a toupée,” “a racist KKK and Nazi sympathizer” and a “woman-hating neo-Nazi-sympathizing sociopath” are among his punchier insults. Starmer himself is on record describing the president’s views as “absolutely repugnant,” and he once tweeted, “Humanity and dignity. Two words not understood by President Trump.”

A difficult situation got worse last month, when the Trump campaign filed a complaint with the Federal Election Commission, accusing the Labour Party of “blatant foreign interference” in the presidential race for........

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