Ahead of Elon Musk’s live interview on X with former President Donald Trump, the European Union’s commissioner of the internal market wrote a letter to the platform’s owner warning him that he could face repercussions if hate speech and disinformation are not kept in check.

Musk is scheduled to speak with Trump at 8 p.m. Monday. With nearly one-third of X users living in the European Union, Thierry Breton reminded Musk he has an obligation to comply with standards set by the Digital Services Act, which addresses the regulation of illegal content and disinformation across social media and other online platforms.