TikTok CEO Shou Zi Chew is set to appear before Congress to defend his company amid data security concerns over the Chinese-owned social media app. NBC News’ Julie Tsirkin and Executive Director of the National Security Institute, Jamil Jaffer, break down why lawmakers are concerned about safety on TikTok and what to expect from Chew's testimony. 

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#TikTok #Congress #ShouZiChew