On Closeup, U.S. Rep. Chris Pappas said he believes there are national security concerns related to the use of TikTok in America. Subscribe to WMUR on YouTube now for more: http://bit.ly/1lOjX9C Get more Manchester news: http://www.wmur.com Like us: https://www.facebook.com/wmur9 Follow us: https://twitter.com/WMUR9 Instagram: https://www.instagram.com/wmur9/