https://www.reuters.com/article/us-usa-tiktok-navarro/white-house-adviser-navarro-questions-microsofts-china-ties-amid-tiktok-discussions-idUSKBN24Z1SM >Any potential buyer of Chinese-owned TikTok that has operations in China could be a problem, a White House adviser said on Monday, amid reports that President Donald Trump was weighing whether to allow a U.S. company to buy the popular short-video app in lieu of an outright ban.