but I wouldn't be surprised that Trump would "donate" billions of $$$ to Qualcomm, like he did to the farmersXiaomi and BBK may not have enough technological and financial resources to replace every chip from US sources. They do use Mediatek (Taiwan) and Spreadtrum when they can. Not their fault that Huawei doesn't let HiSilicon sell Kirin chips to them, although recently there is a Xiaomi dash cam that uses a HiSilicon chip.
Its also the other way around. Qualcomm needs Xiaomi, BBK and the rest of the Chinese phone makers. Barring them would kill Qualcomm.