Elon Musk and the EU are in a dispute over the Twitter owner’s plan to use more volunteers and artificial intelligence to help moderate the social media platform, as the company responds to strict new rules designed to police online content.

According to four people familiar with talks between Musk, Twitter executives, and regulators in Brussels, the billionaire has been told to hire more human moderators and fact-checkers to review posts.

The demand complicates Musk’s efforts to reorganize the lossmaking business he acquired for $44 billion in October. The new owner has slashed more than half of Twitter’s 7,500 staff, including the entire trust and safety teams in some offices, while seeking cheaper methods to monitor tweets.