The latest U.S.-China clash over the popular social media app TikTok is likely to worsen the already-deteriorating relationship between the two countries, as Beijing and Washington tussle over software bans, technology exports and concerns about espionage and national security. Last week, the Biden administration renewed Trump-era efforts to allay security concerns about TikTok, created by Chinese tech giant Bytedance Ltd., by demanding that the wildly popular app be sold from Chinese ownership or face a possible ban in the U.S. On Thursday, TikTok CEO Shou Zi Chew underwent a bipartisan grilling by a House committee whose members asked pointed questions...