China is an ever-present risk for Apple, but this week it's front and center on reports that China, which makes up 19% of Apple's revenue, is restricting the use of iPhones at government agencies, and the resurgence of Huawei - its new Mate 60 Pro smartphone is seen as the first significant threat to Apple's dominance in the market in years. Widely-followed hedge fund manager Dan Niles joins to discuss those headwinds and why Apple is now his largest single-stock short.