The CEO of TikTok tried to reassure U.S. lawmakers — who have renewed concerns over its sharing of U.S. user data with employees in China — that the video app company is taking steps to restrict that access to only a “narrow” slice of data. TikTok CEO Shou Zi Chew sent a letter dated June 30 to nine GOP senators in response to their inquiry this week “demanding answers on TikTok’s backdoor data access for Beijing,” a reference to China’s communist regime. Fears that TikTok represents a national security threat go back several years. In August 2020, President Trump ordered...