https://www.reuters.com/article/us-usa-tiktok-navarro/lawmakers-welcome-tiktok-u-s-sale-as-white-house-adviser-raises-concerns-idUSKBN24Z1SM >U.S. Senate Democratic leader Chuck Schumer on Monday joined other senators in backing an American company to purchase Chinese-owned video app TikTok's U.S. operations, while a senior White House adviser raised concerns about a sale to Microsoft Corp .