EDITORIAL. The British monarch's visit to the United States, and especially his speech on Tuesday before Congress, carries symbolic weight for all Europeans committed to the rule of law and the preservation of balanced ties with the US.

The king faces possibly his most important ever speech and a thin-skinned president, in the shadow of the Sussexes and the Epstein scandal. What could go wrong?

A rift between the U.K. government and Donald Trump over issues including the Iran war has raised the political stakes for the British monarch's visit.