Russian officials are facing mounting questions after the mysterious death of a 28-year-old Russian researcher at a lab in Siberia that studies plagues. Now, U.S. health officials are calling for Russia to release more information about the death and prevent a potential outbreak. “Something like that gets out, it could quickly spread so we’re watching and monitoring it closely,” Secretary of State Marco Rubio said. NBC’s Ryan Nobles reports for TODAY. » Subscribe to TODAY: youtube.com/@TODAY TODAY brings you the latest headlines and expert tips on money, health and parenting. We wake up every morning to give you and your family all you need to start your day. If it matters to you, it matters to us. We are in the people business. Subscribe to our channel for exclusive TODAY archival footage & our original web series. Connect with TODAY Online! Visit TODAY's Website: today.com Find TODAY on Facebook: facebook.com/today Follow TODAY on Twitter: http...