Political leaders have shunned the Alternative for Germany. But on his social media platform X, Mr. Musk is pitching the party as mainstream.

With Elon Musk using X to troll officials and push conspiracy theories, Germany's government faces calls to quit the billionaire's social media platform. Many organizations already have, as have several politicians.

AfD is also focused on ending Germany's policy of atonement for World War Two crimes. Its leading candidate for the European Parliament election resigned from the party in May amid public outcry, after declaring that members of the SS,