New Delhi, March 27 -- Donald Trump has sought to dismiss Signalgate as "the only glitch" in his two months as US president for the second time. But this will not wash with others around the world. Indeed, not even in the US. Even more bizarre than the accidental inclusion of a publication's editor in a Signal chat on a plan for military action overseas is the fact of social media being used for the purpose.

This apparently casual approach to the operation-strikes aimed at Houthis in Yemen-stands in contrast to the gravity with which US armed forces would presumably have treated it. According to the journalist in question, Jeffrey Goldberg, editor-in-chief of the Atlantic, the Signal group had America's top-most security officials as par...