LONDON – Do not antagonize one's opponents unnecessarily, a basic principle of diplomacy says. But as the United States faces a trade war with China and various tensions overseas, President Donald Trump's emissaries are increasingly ticking off allied countries and being called to account.

Just this week, no fewer than three U.S. envoys scrambled to extricate themselves from diplomatic hot water.

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Denmark’s foreign minister summoned the top U.S. diplomat in the country to answer for reports that at least three people with connections to Trump have been carrying out covert influence operations in Greenland , a Danish territory. France summoned the U.S. ambassador , Trump in-law Charles Kushner, over his letter to President Emmanuel Macron alleging the country h

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