Ismael Zambada, leader of the Sinaloa cartel, and Joaquín Guzmán López, the son of El Chapo, have surrendered to U.S. authorities, but concerns are growing for an upcoming power struggle within the cartel and the potentially bloody consequences it could bring. #SinaloaCartel #ElMayo #ElChapo 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