According to reports, Apple has warned its suppliers that China may take revenge for this week's controversial visit to Taiwan by the speaker for the US House of Representatives, Nancy Pelosi. This response could disrupt shipping of iPhones and/or their components. While iPhones are assembled in China, many of their components are sourced from other countries. If China were to block shipments of these components, it could cause significant delays in the production of iPhones. In addition, China is a major market for Apple, and any disruptions to shipments could have a significant impact on the company's bottom line. Apple will be monitoring the situation closely and taking steps to ensure that its supply chain is not disrupted.