England’s High Court ruled Thursday the British government can’t formally launch the Brexit process without Parliament’s approval. The government can appeal, and it is expected to do so. Still, the ruling marked a clear setback for Prime Minister Theresa May’s plans for the country’s exit from the European Union. Lawmakers could demand changes in May’s approach, and a majority could delay or, theoretically, even block the process, although May’s Conservative Party holds a majority. The British pound, which has been dragged down since the June vote to leave the E.U., surged against the dollar on the news.