“Remember when I got in trouble for calling out Mr. Nazi Salute ... a “Nazi salute,” many other observers have suggested that Musk was instead performing a “Roman salute” that ...

Despite being called to, Mr Musk hasn't offered any further explanation. Some say it was not a Nazi salute but a Roman salute, also used in the era of Italian dictator Benito Mussolini.

It came a month after Elon Musk made a similar salute, and at a combustible moment when the administration of Mr. Trump, who has long been dogged by charges of encouraging far-right extremism ...