It’s a showdown between the world’s richest man and a Brazilian Supreme Court justice.

The justice, Alexandre de Moraes, has threatened to suspend social media giant X nationwide if its billionaire owner Elon Musk doesn’t swiftly comply with one of his orders. Musk has responded with insults, including calling de Moraes a “tyrant” and “a dictator.”

It is the latest chapter in the monthslong feud between the two men over free speech, far-right accounts and misinformation. Many in Brazil are waiting and watching to see if either man will blink.