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Almost three years have passed since the Donald Trump administration first threatened to ban TikTok in the U.S. but was blocked in court. Earlier this month, for the first time since President Joe Biden took office, the administration demanded the Chinese parent company of TikTok either divest stakes in the app or face a potential ban. Last week, TikTok CEO Shou Zi Chew, who was born and raised in Singapore, attended a congressional hearing that turned into a five-hour grilling. Globally, TikTok is ranked the most popular social media app, having been downloaded more times in 2022 than Facebook, Instagram and WhatsApp, according to analytics firm Apptopia. Why do U.S. lawmakers want to have it booted from American soil? And why are they pushing for it now?