Both President Trump and Elon Musk are warning about something that could send the market down 50%...   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏   ͏