Mr. Musk has fallen out with prominent right-wing Americans who say they are worried that their agenda may be sidelined in favor of his own — and that he is willing to silence them on X.

The Trump ally has flooded X with posts criticizing European politicians, causing a diplomatic conundrum for the continent’s leaders.

Musk, who has used X to amplify conspiracy theories and promote far-right talking points in the U.S., has more recently set his sights on Europe.