TSLA) Chief Executive Elon Musk is expected to visit China this week, three people with knowledge of the matter said, in what would be his first trip to the country in three years. It would also come at a time when Tesla is grappling with multiple issues, including intensifying competition with Chinese automakers that are exporting their China-made electric vehicles as demand in the world's largest auto market weakens. "Tesla is building a plant in Mexico expected to produce a lower-cost electric car built on its next-generation platform