Chad Wolf, former acting secretary of Homeland Security, and Tracy Walder, a former CIA officer, join "CUOMO" to discuss Afghan national Rahmanullah Lakanwal being named the suspect in the D.C. shooting. "I think there needs to be a broader look at all the individuals who came in under the Operations Allies Welcome program," Wolf says. Walder adds, "If this is connected to terrorism, are there other individuals attempting attacks like this?" #dcshooting #nationalguard #terrorism Anchor Elizabeth Vargas delivers the biggest stories, without bias or opinion. Watch "Elizabeth Vargas Reports" every weeknight at 7p/6C on NewsNation. #VargasReports 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