US Senator Dan Sullivan sent a letter to the US Commerce Committee leadership on Wednesday requesting the panel to hold a hearing on privacy and national security concerns related to the social media application TikTok and its ties to China. "I write to respectfully request that the Senate Committee on Commerce, Science and Transportation hold a hearing on the persistent privacy issues, national security concerns, and troubling influence over our children associated with the social media application TikTok," Sullivan said in the letter, obtained by The Washington Examiner news outlet. Sullivan expressed concern about the availability of US user data…