NewsNation's Mills Hayes joins "NewsNation Prime" to discuss the latest in the D.C. National Guard shooting saga as investigators continue to search for the motive behind the incident, including possible PTSD from alleged shooter Rahmanullah Lakanwal. #rahmanullahlakanwal #dcshooting #motive "NewsNation Prime" is America’s source for unbiased news offering a full range of perspectives from across the U.S. Weekends starting at 7p/6C. #Prime NewsNation is your source for fact-based, unbiased news for all Americans. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij