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

The publicity was a potential boon for AfD, which has been frozen out of mainstream politics, in part, because its leaders have downplayed Nazi atrocities.

Tech billionaire Elon Musk held a live interview with the leader of Germany’s Alternative for Germany party on Thursday. Alice Weidel, the Alternative for Germany, or AfD, co-chairwoman, joined the mogul in a livestreamed X space to pitch her party as an alternative to the European power’s entrenched policy agenda,