Texas DPS Lt. Chris Olivarez joined NewsNation’s “Elizabeth Vargas Reports” to detail the challenges border officials face in vetting migrants arriving in the U.S. #USMexicoBorder #Immigration Anchor Elizabeth Vargas delivers the biggest stories, without bias or opinion. Watch "Elizabeth Vargas Reports" every weeknight at 6p/5C on NewsNation. #VargasReports NewsNation is your source for fact-based, unbiased news for all America. 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