One of China’s most important meetings begins Monday, as its top leader Xi Jinping and other ruling Communist Party elites gather to map the country’s goals for the next five years. The closed-door gathering — known as the fourth plenum — will tackle policy proposals and details of China’s next five-year plan, a blueprint for 2026-2030. The leaders are meeting at a time of heightened trade tensions between Washington and Beijing and just ahead of a possible meeting between Xi and U.S. President Donald Trump later this month.