On May 29, the lower house of Poland’s parliament voted 428-3 to honor the 250th anniversary of American independence. Nobody voted against. Watching from the gallery was Tom Rose, the U.S. ambassador who had spent the previous four months in an open, personal feud with the marshal who announced the result.

Rules of professional diplomacy say that a combination is impossible. An envoy who attacks the speaker of a host parliament in public is understood to have forfeited the relationship. Rose attacked him twice, in writing, by name, and the relationship did not move an inch.

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The claim here is not that the feuding produced the vote, as it obviously did not. The claim is narrower and harder to argue with: Warsaw’s key assumptions, about what an ambassador must never do, turn out to be wrong.

Rose did not come up through the foreign service. He ran The Jerusalem Post for eight years, cohosted a talk radio show with Gary Bauer, and served as chief strategist and senior adviser to Vice President Mike Pence. He is an Orthodox Jew and an unembarrassed Zionist, and he treats neither as a private matter to be filed away on arrival. It is the equipment he works with. He presented his credentials to President Karol Nawrocki on Nov. 6.

He represents his president, not the building

On Feb. 5, after Sejm Speaker Włodzimierz Czarzasty said President Donald Trump “does not deserve the Nobel Peace Prize,” Rose announced the embassy would have “no further dealings, contacts, or communications” with him over “outrageous and unprovoked insults directed against President Trump.” Prime Minister Donald Tusk answered within hours: “Mr. Ambassador........

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