Alexandre de Moraes, a Brazilian Supreme Court justice, ordered internet providers to block access to X across the nation of 200 million because the company lacked a necessary legal representative in Brazil.

Mr. Musk closed X’s office in Brazil last week after Justice Moraes threatened arrests for ignoring his orders to remove X accounts that he said broke Brazilian laws.

X said on Thursday that it viewed Justice Moraes’ orders as illegal and that it planned to break their legal seal and publish them. “Unlike other social media and technology platforms, we will not comply in secret with illegal orders,” the company said in a statement.